It's not good, It's not bad. I think it would have done better with more line art, but that's something that's obviously up to you.

Hello me fellow! I like the pic, it still shoulda been colored like Kayko, seriously. Ok byeeeeeeeeee

Her pose is really cute, and the coloring's really cool ^-^ Your sister does a great job coloring. Neat drawing, all in all. It really stuck out.