Tips Wanted on Journey – Learning to Program a Photo App

I've just started to learn how to program (ruby on rails), because I wanted to create a photo app with 1 feature I had in mind.

My question is, are programming photo apps any harder to learn/code than normal apps?

Does it take more time to program photo apps than any other normal apps?

I'm new to all of this, so I try to guess how hard it will be (or guess how much time it may take) to learn all of this, to program a photo app. (I'm a heavy right brain person too, I know you guys hate me)

Anyhow, I would love to hear your thoughts, and suggestions/tips you would have on my journey to learning how to program a photo app.