First off, welcome to the art gallery.
Now critique time;
I really like the use contour lines and line weight variations. I would have loved to seen it carried throughout the rest of the figure and form. From the looks of it you have fallen prey to what all artists do at some point; drawing the most fun part first. It looks like you had lots of fun drawing the torso and skull and then rushed the limbs a bit. No worries, we all do it. I would love to see the same level of attention carried over from the skull and torso.
I would also like to see a little more done with the negative space behind the form, something to give it a little more touch of drawing. Something to make the negative space feel intentional.
You mention that you couldn't figure out how to make the fire correctly. I must say I really like this take on fire, but you are correct in that it doesn't exactly match the rest of the composition. Perhaps in a slightly more whimsical or cute variant of Xan I could see this take on fire working outstandingly. But in your current composition I believe the in-game method of drawing fire would have sufficed. You have a very comic book esque look to your composition & dragonfable is a manga/anime art style, i.e. the approach will be very similar when drawing fire or other complicated things.
Lastly you mention that you do not have much time for your hobby, I too have this problem, every artist does actually. The secret is to commit to 5 mins. Tell yourself you will just draw for 5 mins. You always end up having fun and getting lost in what you are doing. At the very least you get 5 mins more done on your latest art project!
Anyways I cannot wait to see more from you in the future! ArtOn