Roofs!

[Dahlia47]

Which is best and what am I missing?
Our roof is the only big thing that needs to be redone. I was looking at the roof this afternoon as I was finishing my daughters canopy bed. I added a curtain and replaced the canopy material with plywood... much more comfy for her. Luckily I had a small mattress for her. I added some hooks to hang stuff up on and when I got a glimpse of the roof
in the inside, I decided it is going to get done in the fall.
So which is best...an arched roof, a frame roof, flat roof? Metal, plywood? Any other types of roofs that are recommended?

[noseoil]

Pictures would help, no idea which type of build you have...

[Dahlia47]

I tried to post some pictures, but it wouldnt let me. It said invalid file. Im going to try my best to describe it.

Right now the roof is at a slight incline from front to back. It is starting to bow downward a bit due to the way the supports were done. They were done in small length wood pieces going the long and short lengths. Kinda like a checker board. Rather than just one piece going one length.
We would like to add a few inches in height. Would it be easier to have an arch going across or an arch going from front to back? Or an acute sharp angle like a house would have?

Im hoping I described that well. And I will try to see why it wouldnt let me post pics.