I have to ask, have you seen a working vagina before?
Rinz has pretty much hit the mark. Do not expect to improve your skill levels by working digitally at this stage. It would be far more advantageous to do some anatomical and gesture studies via pencil
and paper. Even a tablet will not help much at your level.
Life drawing is a phrase you will see repeated often when most people are giving serious advice on how to improve. This encompasses, real people, animals and household objects. You are essentially
trying to translate a 3d shape into a 2d image. To do that adequately, you will need a far stronger understanding of the fundamentals, depth, gesture, proportion, lighting. This image is little more
than a light outline comprising of some symbols and has no weight or structure whatsoever.
Two more pieces of advice, find a proper image host for this kind of material, like fur affinity itself. This kind of picture goes against tinypics TOS.
Secondly, lose the massive watermark. Its a sketch, thats all. Nobody is going to steal it. As you put more of your work on the web a watermark
that size will just come off as pretentious.
If you are serious about improving quickly, studies and sketches of real objects and people are the answer.