This is obviously still a work in progress, some areas still have no values and there shapes need reforming, I do plan on adding color when I am happy with the values. Any feedback would be much appreciated.
Do plenty of thumbnails as well.
A smooth sea never made a skillful sailor.
Human beings, who are almost unique in having the ability to learn from the experience of others, are also remarkable for their apparent disinclination to do so."
I can see you have a good idea. You lack the fundamentals unfortunately. Here's what I recommend you do.
pick an interesting frame of a musical and copy it. Pay attention to the motion.
copy a page from an anatomy book. A page that features the skelleton in motion if you can.
Then it's time to start this picture over. Take as long as you need to get the proportions, composition and movement right. Stick to line for the time being. Or better yet just the gesture and move forward from there.
The end result won't be perfect, but you'll be stepping in the right direction. You'll be studying without being creatively derailed.