I've made a few hundred mockups at this point — for t-shirt drops, packaging, hoodies, random merch ideas people had at 2am. The mistake I see constantly, even from people who pay for stock mockup templates: flat lighting.

A mockup reads as "real" the second it has a light source. Stock templates usually have generic, evenly-lit fabric because it's meant to be reused for a thousand different designs. That's exactly why it looks fake on YOUR product — there's no shadow falling where your logo actually sits, no fabric fold interrupting the print, no slight color cast from the environment.

Three things that instantly make a mockup look shot in real life instead of pasted on:

1. Directional shadow — pick one light source and let it cast a real shadow across the folds, especially where the print sits.

2. Micro-imperfection — a tiny wrinkle, a slightly uneven print edge, a subtle fabric texture. Perfect = fake.

3. Context — an empty studio background screams "template." A hint of environment (a rack, a hand holding it, a shadow on a table) sells it as a photo.

This is basically the whole difference between a mockup that gets ignored and one that gets someone to actually click "buy" on your store. If you're building a product page or an ad and the mockup still looks like a template, that's usually the reason.

I do custom ones now for exactly this reason (people were tired of the free-template look) — but even if you DIY it, fixing lighting alone will get you 80% of the way there.