This seems great for a first attempt! I have some suggestions I’d like to give to potentially help you improve in the future.
Suggestions:
The posing of the avatar looks off, they’re sitting in a unnatural position. I would try working on that next time.
Try adding some effects in your GFX to really make it stand out, as the overall vibe seems a bit bland.
Overall, it’s looking good so far. There are areas where you need to improve, but you have a general basis on what to do. You should be proud of yourself.