So, there's obviously room for improvement, by the look of it you don't draw too, too, often. Firstly, what drawing program have you used here? I'd recommend using Krita for digital art, since it is totally free, and easy enough to download and install. Secondly, if you want to draw on a comp, and are willing to spend money on the hobby, I recommend picking up a cheap drawing tablet off Amazon. There's bound to be some on there for about 80 USD, maybe less depending on what brand you go with. With that, it'd take a bit a practice to develop muscle memory, but you could always draw on real paper with pencil first and then scan the drawing and trace over it with the tablet via Krita. You might be able to get better results like that until you'd get comfortable with it. Of course, if your happy with the results you're getting currently, and enjoying the hobby that's all that really matters, but those are some tips I can offer to point you in the right direction if you want to improve. With those tips you could just watch and find YouTubers who could get you more familiar with drawing software.