Aaa, thank you for pointing out my colouring. I am just starting to watch the colour theory video, so thank you again for pointing out how my colouring style lacks certain amounts of value. I just flipped the image on a new piece of art I'm dishing out sometime in the future, and I do see some flaws in it (i.e. one eye looks a bit off so I am fixing that. Another example is how one eyebrow is less curved upward than the other, so I am fixing that as well.)
As for anatomy, I have been looking up reference pictures (and I hope to look up more in the future for further artistic flourishment) and I do want to watch some tutorial videos on how to draw the human body in a more realistic light than the usual cartoon like style (because sometimes seeing the same style over and over again can be a bit dull and it's okay to come out of the bubble and experiment on new stuff and possibly stick to it as your art slowly improves over time). One thing I have noticed on some of my art pieces, the arms don't really have muscle to them (they're kind of like logs imo), so I may work on that a little more so that it looks more real. Another thing is I want to draw diverse body shapes (curvy/thick, skinny, chubby, etc.) so I might also look up reference pictures of the shapes I mentioned in parenthesis. Again, thank you for the helpful criticism.
-also, how do you convert a coloured image into greyscale on Medibang?-