Alright, so Anatomy is an issue here. It's a very hard thing to master so it's okay, you just gotta keep practicing it. The biggest issue anatomy wise is the body. Her shoulders are both too far down and too small. The chest curves too much and gives off the impression that she has one big boob and one really little boob. And then the body curves immidiately into her butt. The best way I know to combat this is to sketch out a skeleton. Use a box for the chest itself, underneath add a small box for the ribcage, then draw a rectangle for the body. From there to create the hips draw another box but it curves out a bit from the body. Draw some circles on that for thighs, draw a circle for the kneecap, and so on. Basically, work with basic shapes to create a person with the skeleton in mind. The other big issue is in your shading. It almost looks like stippling but the dots are too big and there's not enough. You also used the dark blue to shade which when too much is put on with the paint roller, cause

S them to look like they have a really bad rash.. When shading, use your custom colors! Use a color that is just under the middle in brightness for smooth shading and I suggest using a very low saturation red. To shade, do longer strokes. Shadows have to do with your light source. Say light was shining on the ball from the right, the shadow would be casted to the left. If that makes sense. And most of all, clean your linework up, that always makes it look less rushed and more intentional