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The edges aren't smooth enough at all and many of the parts come to a sharp point. Also, outlining the mouth white isn't a good idea. It looks unattractive.
The random black outlines could be changed to a dark blue to make it look more professionally done. Again, the edges aren't smooth enough. However, this is still a very nice picture.
The body is perfect, but the face needs work. It's not smooth near the tip and the bottom and seems to have a bit of a dent in it. The eyes aren't the same size either, which is usually okay, but in this picture it looks awkward. One last thing: The right ear comes to more of a point whereas the left ear is more rounded at the tip. It's one or the other.
The bottom looks a bit weird, but it's nothing a touch-up can't fix. I can't really find anything notably wrong with it other than the sharp instead of smooth lines (and I'm sure you're sick of hearing me say (type?) that). The fire is also well-done.