My daughter spent two months creating photomontages for her digital media elective. I'm a photographer, so I watched her struggle with problems I'd already solved—but had to let her figure them out her way. Here's what she got wrong and how she corrected it.

Mistake One: Ignoring Resolution

Her first composition mixed a 4000-pixel-wide photo with images scraped from websites at 800 pixels. When she tried to resize the small images larger, they turned into blurry messes. She didn't understand pixel density.

The fix: She learned to check image properties before starting. Now she downloads the largest version available and scales down if needed, never up. Her rule became: if it's under 2000 pixels on the longest side, find a different image.

Mistake Two: Mismatched Perspectives

She put a photo of herself taken from eye level onto a background shot from ground level looking up at buildings. The perspective lines didn't align—she was looking straight ahead while everything else angled upward.

Understanding this required printing reference images and drawing the perspective lines with a ruler. Once she saw how horizon lines and vanishing points needed to match, she started choosing source images more carefully.

Mistake Three: Inconsistent Light Sources

This one took longest to fix. She'd combine a subject lit from the left with a background where sunlight came from the right. The shadows pointed opposite directions.

Her solution was creating a reference checklist: note the light direction in each source photo before combining them. She started rejecting otherwise good images because the lighting didn't match her main subject.

Mistake Four: Over-Sharpening

After learning about the sharpen filter, she applied it to everything. Her composites looked harsh and artificial, with halos around edges.

She discovered that sharpening should be the final step, applied once to the flattened image, not to individual layers. And even then, subtly—she started using values around 50-70% instead of 100%.

Mistake Five: Forgetting Atmospheric Perspective

Objects in the distance have less contrast and shift toward blue. Her backgrounds were too sharp and saturated compared to foreground elements.

She learned to add a slight desaturation and blue tint to distant layers, plus a tiny Gaussian blur—usually 1-3 pixels depending on how far away something should appear. This single adjustment made her work look dramatically more realistic.

What Changed Overall

She stopped rushing. Her first montages took 30 minutes. Now she spends 3-4 hours on a single piece, mostly on selecting the right source images and making tiny adjustments to blending. The technical skills came quickly; the judgment about what looks right took much longer.