Johns Glasses Prototype

Here is a concept of an ecommerce store. It can be of anything but here I have used an example of eye glasses.
You can see the designs in detail in the next screen.
Screen 1) The user lands on a splash screen.
Screen 2) He/She selects their desired store.
Screen 3) User selects the product & click more for details.
Screen 4) User adds the product to cart & checks out.

Feel free to share your feedback in comments.
Screen 4)