I agree that it needs to be tweaked a bit so the images align better. It doesnt handle portrait oriented images very well.

I think as programmers, sometimes we fail to realize that just because something is simple to us doesnt mean it is to everybody else. The reason I put this together is because whenever I saw these types of images posted somewhere, non-technical people would reply saying they wish they had a way to do it themselves.

There werent many technical challenges honestly. The lessons I learned were more about finding something people want and delivering it quickly with the minimum features. Now I can tweak and iterate and try the more challenging aspects.