Deal.
As in every game based on the renpy engine, you can hide the ui at anytime by pressing H.
I never thought that this feature could be interesting but I could imagine implementing it in a more practical and visual way if there is a demand for it.
I don't think there is that kind of feature in the Android port.
I will have to develop something specific. I'll put it on my list but it really won't be a priority.
Alternatively, you can look at some of the images through the achievement page.
Some achievements allow you to access a gallery. Maybe that can help.