The fire is wrong. The hottest part of a flame glows white. the coolest part is darkest.
This piece really Really needs anti-aliasing.
As well as the flame's animation. It's just bouncing around randomly.
Just trying to help.
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Maybe the sketchy look and the random flame is just the style. I quite like it. Except the flame colouring is wrong like smokehound said.
And if u wer trying to copy the anime, the flame is nowher near spiky like that. In the anime/ manga - the flame is roundish and more smooth.