Super Mario Bros. T-Shirt Design

So this is my current Super Mario. Bros. T-Shirt Design, Pretty much finished the outline of the entire thing, but before I start to add colour, I was wondering whether there is anything I could improve? You guys probably have more experience with this stuff than me.

Thanks c:

Watch this

this is a really good design. its brilliant. unfortunatly it may be refused due to copyright issues but i still think its a brilliant design!

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