The feedback form states the following:
We read all feedback carefully, but we are unable to respond to each submission individually. If you provide your email address, you agree that we may contact you to better understand the comments you submitted.
So, if your feedback isn't clear, it's possible that you will be contacted. In that case you would be able to give additional information, probably including pictures.
I would guess though, that the people reading the feedback have read enough that they understand what you're talking about. If you were to write, for example, "It would be nice to have the time show full screen with nothing else on the screen," I'm sure people would get it.