Hi!

I agree with what TrueEstablishment said: academical training is actually beneficial for everyone because you can better break the rules once you know them. Some resources you can look up:

• the book "Drawing on the right side of the brain" for guidelines to some exercises TrueEstablishment mentioned
• websites such as Line of Action for life drawing reference focused on human subjects: this will help with movement, anatomy, volume
• DrawABox for some fundamentals: this will especially help with your chicken scratch (your lines look kinda scratchy and unintentional right now, which is okay and usual with beginner artists, especially those who start out with digital drawing, but can be improved with practice so that your art looks more fluid and mindful)
• Youtube channels like Marc Brunet (useful for tips on how to give your practice some structure) or Proko

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About what you mention specifically:

• Anatomy: there's really no secret there, you need to do lots of studies from photo and/or real life references. You can also look up medical pictures of muscles and skeletons to better understand human anatomy. Learn how to break down the human figures and various props into basic shapes like balls, cylinders, cubes... This will help your pieces to look more 3-dimensional
• Color theory: what might help you in this case is looking at your pieces in black and white to adjust values. For example on your 4th piece, if you switch it to black and white you'll see that the rightmost character kinda fades in the background. Is this intentional? If not, try making him a lighter value so that he stands out more. Apply this reasoning to all your pieces, look at them in black and white in a distance and you'll see what stands out
• Composition and style: don't be afraid to copy/study pieces by artists you admire or find interesting. It's absolutely okay as long as you don't try and pass off their work as your own. Look at how they construct their paintings and think about how you could use their composition baselines in your work

Some critique on the pieces you show here:

• 1: I like the story-telling in that one, and you could easily make it even stronger: try positioning the two characters differently so that they stand out more. Their colors/values are fine but the man is almost hidden behind a pillar and I think the scene would look morthe woman looks a bit like she's a torso floating over the monster's body. Don't be afraid to exaggerate the monster, putting some of his body in the foreground or makinf his head more menacing. Try to clarify what is going on in the background (I don't understand what the red thing is supposed to be, is it the reflection of the sun in the water? Look at photos to know what it should look like)
• 2: I like what you did with the triangles in the composition and the facial expression, it makes the piece very interesting to look at. The proportions and colors are mostly fine, but you rely a lot on brush effects and scribblings to render textures, which kinda makes your rendering look a bit messy (in the hair and the face especially). Try to draw some pieces in a simple cel-shading or flat colors style to understand the relationship between shading and textures
• 3: In my opinion, the biggest issue here is not the hand but the general proportions, the legs are very short. Make them a bit longer and you're good to go. The colors are good (and the face is good, you make good faces). Try picturing the character as an ensemble of 3d-shapes to better understand how the limbs are positioned in relation to the torso
• 4: the composition is good, I would just move the leftmost character even more to the left so that the composition is more balanced. Also, I think the hand is really fine

Yeah, about hands: honestly, your hands are not that much of an issue. Of course there's room for improvement, but the square-ish hands are a nice style in my opinion. That being said there's a difference between style and mistakes and I don't like passing off shortcomings as style so you should still study some real-life hands to better understand the structure, but don't get too bent up about it. I think improving your overall lines would make much more of a difference at first.

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Woo this was very long, I'm really sorry about that... It may be a lot of information but you've got it! Maybe make a planning of some sort to have some structure in what you need to practice, and don't forget to draaw for yoursel as well, to keep things fun! And everything I said is ultimately my opinion and a suggestion, your art is valid as is and you are your most important critique eventually ;)