Looks to me that you have too much polygons to play with but if that's your thing go ahead have fun , other then that you doing ok with small exception like things in the image below and forearm will need some volume and probably rotation adjustments
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if you aren't all ready, I would greatly recommend using as much anatomy references as you can possible gather.
Some notes:
the shins look like they are curving
overall your cuts into the muscles are to deep
I would work on how the muscles connect into each other, they normally have a specific flow and tend to tuck into other muscle groups
There are no straight lines in the human body
good luck, keep at it, looking forward to seeing more progress