If you want to do characters then study human anatomy, that is the biggest thing you can do, it doesn't matter how alien you want to make a creature, if you don't have human anatomy down it won't look right. When you are making this creature your work station should be surrounded with photos of naked people, even the best character artists are always looking at source material. Also when it comes to making characters, you have to do it everyday, the best concept artist will draw all the time no matter where they are. Keep it up, you have potential.
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