It looks a pixel art and I think you did have lots of time because it looks to take time to create. Brings back memories of past before I met Gimp.
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Well I also used MS Paint when I want to edit or create images but Gimp showed me how wide image manipulation is .
(see UI Brainstorm!). Discuss or seek help from other Gimp users and developers. Be part of the to create and receive daily topics. Gimp Users and Gimp Developer are good to try.