>>5013888>I'm interested in colored paintings, but I've been sticking strictly to values.
There's really no reason to do greyscale only once you have the basic bearings of it down.
The problems with your work are all pretty straightforward and fundamental. To take >>5013890
for example, it's clealy unfinished for one. The perspective is also confusing. The eyes on the girl's face are crooked, her neck is short, and the fingers are oddly short, lack joints, and are holding the cards in an unnatural way. The rendering is overall very muddy. I'd do a paintover but that would frankly entail redrawing the whole piece, which wouldn't be great help to you imo.
If you can I'd reccomending find a non-anonymous community of artists you respect with skills of your level/above (the las discord is pretty good if you can get into it) and make a habit of asking them for critiques for every piece you do. That will help give you a comprehensive idea of what you should be working on over time, moreso than me just spewing "study fundies" at you in this post, since that's honestly what you need.