Hello Matthew!
I've looked through the images you posted and there are some seriously stunning pieces in there! Amazing job. :)
I have to ask, is the issue with you being unable to draw something from your own head? Some of the images are exceptionally well drawn in a lot of highlight and shading detail, and I'm not exactly certain in what way we can help further your skills if you're already so good at creating detailed works.
However, it's not uncommon for people to be good at drawing what they see but having a tough time at creating figures from nothing. I'd love to give my thoughts on the gesture drawings, but I don't want to give you useless info.
Can you be a bit more specific with what the problems are you're facing? I'll try to reply asap!
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