here's some determination you're doing really well, just keep it up. and don't be scared to work from imagination either, no matter how bad you think the results are. a healthy balance of studies and imaginative work is good to have (and it makes things fun too!). keep an eye on those proportions: some of the wrists in the last pic are pretty flimsy compared to the hands, but I'm sure you'll pick stuff up naturally.
love what you do, never feel as though it's cheating to reference your work from imagination against real life stuff (it helps your understanding a hefty bit I've found) and keep up the good work. can't wait to see where it takes you
What an overwhelming lesson to all artists! Be not afraid of absurdity; do not shrink from the fantastic. Within a dilemma, choose the most unheard-of, the most dangerous, solution. Be brave, be brave! - Isak Dinesen