I sketch every composite before I open Photoshop. Paper, pencil, sometimes a cheap ballpoint if that’s what’s nearby. The sketch isn’t about being precious. It’s about committing to a light source before I’ve spent three hours cutting out a figure, only to realize the stock image I chose has the sun coming from camera left and my background has it blazing in from the right. That’s a composite that can’t be saved. Not really. You can fake it, but you’ll always know.

Most compositing tutorials teach you how to fix bad stock choices. I’d rather teach you not to make them.

The Light Direction Problem Nobody Warns You About

When two images don’t share the same light source angle, your brain registers it as wrong before your eyes can explain why. That’s because the human visual system has been calibrated since birth to read light and shadow as a single unified story. You can spend two hours painting in shadows and rim lights, and a viewer will still feel uneasy looking at your piece without being able to name the reason.

Before downloading a single asset, I establish what I call the light contract for the piece. I pick my background plate first, always. Then I annotate my sketch with the approximate sun or light position, the color temperature (warm afternoon gold vs. cool overcast diffusion), and whether the light is hard or soft. Hard light means defined shadow edges. Soft light means gradual falloff. These are not interchangeable in post, no matter what anyone tells you.

Every foreground element I consider after that gets evaluated against those three criteria first, before I even look at resolution or price.

How to Read a Stock Image for Light Quality

Open the stock image preview and look at the catchlights in the eyes if there are people involved. That small white reflection tells you exactly where the light source was. For objects, find the brightest highlight and trace an imaginary line backward. For outdoor scenes, look at the shadow angles on the ground and note where they point.

I use Adobe Stock for the majority of my paid work because the preview resolution is high enough to actually read these details before purchasing. Their standard license runs around $9.99 per image on a single-image plan, or drops to roughly $3 to $5 per image on a 10-image monthly plan. For a movie poster comp that might use six to eight stock elements, that math matters. Getty is sharper in some categories, particularly editorial and fine art photography, but you’re looking at $175 to $500 per image on an on-demand basis, so I reserve it for hero elements where nothing else fits.

For textures, overlays, and environmental elements, Envato Elements at $16.50 per month gives me effectively unlimited access, and I’ll burn through 20 or 30 assets on a single project without thinking twice.

File Resolution and Why 300 DPI Is Not the Whole Story

Photographers and clients talk about 300 DPI like it’s a finish line. It’s not. DPI is meaningless without knowing the pixel dimensions of the file and the final output size of your piece.

A movie poster prints at roughly 27 inches by 40 inches. At 300 DPI, that’s 8100 pixels by 12000 pixels. If your hero stock figure is only 3000 pixels tall, you are already scaling it up by a factor of four before you’ve done a single thing to it. The degradation from that upscale will eat your masking edge alive.

My minimum for any element that will occupy more than 15 percent of the final canvas is 4000 pixels on its longest edge. For the hero figure, I want 6000 or taller. Adobe Stock’s XL files typically land between 4500 and 6000 pixels. Getty’s premium stills often exceed 7000. Unsplash is free and sometimes gorgeous, but the files cap out inconsistently, and I’ve been burned enough times on tight deadlines that I only use it for reference now, not for production.

Matching Camera Perspective, Not Just Angle

This one took me years to internalize. Two images can both be shot from eye level and still feel spatially incompatible because one was shot on a 35mm lens and the other on an 85mm. The 35mm has visible perspective distortion, with parallel lines converging aggressively and a slight barrel effect near the edges. The 85mm is compressed, flatter, with less environmental context bleeding in from the sides.

When you composite a 35mm-shot figure into an 85mm-shot background, the figure looks like a cardboard cutout standing in front of a photograph. Because that’s essentially what it is.

I look at backgrounds for subtle architectural lines, like building edges, floor tiles, or horizon lines, to read the lens compression. For figures, I look at the width of the shoulders relative to the face. Heavy distortion there usually signals a wider lens. When I can, I filter my stock searches by photographer and look for shooters who work consistently in the 50mm to 85mm range, which sits closest to natural human perception and gives me the most flexibility in compositing.

The One Filter Setting That Changes Everything on Adobe Stock

Inside Adobe Stock’s advanced search, filter by “isolated on white” or neutral background and then ignore those images entirely for primary use. Use that filter to find lighting and perspective references for free, then search for matching in-environment shots. The isolated images tell you what a photographer’s lighting rig looks like. The environmental shots tell you whether their work will integrate with a real-world background.

I keep a folder of reference pulls organized by light direction, time of day, and lens type. It sounds excessive until you’re two hours into a search at midnight before a deadline and you know exactly which three photographers on Adobe Stock shoot golden-hour exteriors at a focal length that matches your background plate.

Stock selection is pre-production, not procurement. The composite is either won or lost before Photoshop opens.