Well, I'm not quite sure what this is supposed to be. I think it's a medusa, but I'm not entirely sure. A bit more info about the piece would be helpful.
One thing that really stands out to me are your outlines. There are quite a few jaggies, which makes the outlines looks messy and cluttered. Essentially jaggies are when you surround a pixel line with larger lines or vice versa, thus giving a "jaggy" appearance. Here's a good video on the topic:
https://youtu.be/U6X2sFtugT8A couple of the lines on the neck appear to not be well placed, and that's drawing quite a bit of my attention and it muddies the picture.
I think the strongest point in your piece is the hair. While there still quite a few jaggies, the hair is the most readable part of the piece. Overall it's a decent start and I think you should definitely keep at it!