Looks great to me i really like your artwork! I made one for myself awhile back.
I put pen/pencil pockets on mine along with a couple of slide pockets for bits of paper or whatever and it works out well
I was gonna make it like you have and put both sides in a pocket but decided to make it a little different with a button closure and this has helped because I can add bigger sheets of paper I might be carrying around with me in there andstill keep it closed
here are a couple of pics so you can see what I mean