Hello guys, I'd like to show you our new project. It's a curated collection of product mockups for all designers, marketers and developers. All mockups are free and ready for personal and commercial projects. No Photoshop needed, you just pick one mockup, upload your image and download the final image in high resolution. Everything is processing in your browser so your files are safe.
I think this is a great idea. Unfortunately, several of the images have alignment issues and other problems. One of the mockups thumbnails covers up the user's thumbs with the screen, for example: http://smartmockups.imgix.net/47_bg.jpg?fit=crop&w=360&h=270...
Also, have you thought about doing some basic colour balancing on the uploaded images to match the environment in the image, or overlaying some subtle alpha-channel reflections? (Both of which would greatly increase the realism)
