Hey! this is pretty cool and I look forward to getting my character!
I do, however, have a suggestion. Use your layers. It can be really trickly to colour in otherwise. if you have a layer for the background, a layer for the lines and then a layer title "colour here" There are some tutorials around I think...
It makes it so much easier and nicer to colour in if you have layers!
It's a really cool fish though, good job!