>>7582673
I think some of it is just the liquify holocaust coming back to haunt you, but a lot of your lines, particularly in the splitting and merging of hair, lack a sense of flow, which makes them feel more like just random lines rather than a physical 3D object. Crumpled random lines hold a lot of tension, they look uncomfortable, basically anything with some amount of elasticity wants to turn into either a straight line or a circle. The same thing is happening in parts of the arms and cleavage, where rather than being a nice smooth curve there's a lot of wobbliness making the shape feel much less round and physical. The shading is also not helping much.

If you have trouble making really smooth lines, make your brush a bit bigger and add some opacity to the pen pressure. Those super thin lines look really bad unless you get them perfect, don't be afraid to just step back and use something a bit messier to 'imply' roundness rather than just draw it outright. Pixel perfect lines are pretty hard to do right unless you really know what you're drawing, save it for later.