It needs refinement. Line weights and posing, definitely. One thing to keep in mind is that when drawing a curve, the line should not be the same thickness the whole way through unless every line is the same thickness. Normally to show visual weight, for something that curves away from the point of view the line will be thicker on the ends while thinnest in the middle, and for something that curves towards the point of view the line will be thinner on the ends and thickest in the middle. Thicker lines in general when the lines are between colours would also help the layouts of the images, as would blending the inside intersection of lines so that there's a curve instead of a harsh angle. Do not, however, make the mistake of having the thickest lines be twice as wide or more than any other lines, such as the first image with the cleavage between the breasts and the overlap of the thighs. It'll take some practice, but you'll figure it out the more you just draw random poses.
The basis however is here, and I wish to see this visual style develop further.