slightly better navigation
It's a little difficult to check out multiple models or mockups when you click one and it opens in the same tab. It would make it easier if once we click a model or mockup, it opens in a new tab, or at least once in the mockup screen, there was a button that would take you back to where you left off. As it is now, if I pick a mockup an I have added my logo and adjusted the crop to fit the model, I have to hit the back button several times before I make it back to the screen where I can select a new model from the same category.
J. Cottongim commented
Navigation. The site would work better if you could go back to the last slide / page you selected vs. defaulting to the beginning.