In all honesty, being I do graphics and all....i'd redo it all. Make the edges smoother, you can use the pen tool for allll of the illustration, plus ur lines will be clean for when you do get it printed. Also don't print in a resolution lower than 300 dpi or it won't come out right at all.
Check this piece I did, it's an example on using the pen tool to get clean smooth shapes and lines etc.
It's a vector of Kanye West.