The signature doesn't lead your eye anywhere, there is no focus point. There are vibrant colors on both sides of the character, and near the rawb text.
You could've use less vibrant colors on the sides, and darkened the sides to lead the viewers eye towards the character and the text. I think the text could have been moved closer to the character, and made larger.
the slime is a little disturbing, and the light streaks near its face look like snot. Gross ;~;.
I don't have much advice, it's a pretty random signature. That's fine if that's what rawb wanted.