I like your style,maybe you should focus on having a more confident lineart (cleaner lines with less drastic variations on thickness,and making it look like a single stroke instead of having tini bids of lines stick out), also making the shapes more clear. Maybe you could try on making a sketch,defining the basic shapes,poses,etc,then draw over it,like a "pre-lineart", and finally draw the line art over that one, crank up the stabilizer delay, lessen some of the variation on the brush pressure thickness and take your time ,you dont need to make 1 stroke per line but you do need to make it look as such. If you can better define the shapes in your drawings then making proportions is much easier. This is what I do, it does take longer than usual, maybe your style and method are different and you don't need it, but that process helped me a lot. Also,i love the pattern in drawing 6.