GOD DAMN IT! IM GOING TO GIVE FULL CRITIQUES ON EVERY PIECE OF WORK I WILL COMMENT ON >_<

-Overall-

That shoulder you drew lover down should be on all the arms, it's much better XD
WHY NOT POST THE WHOLE PRACTICE?!

-Un-flexed-

The forearm and shoulder are underdeveloped in comparison to the bicep >_>
The bicep would be facing the view rather than the side in the pic (although I am not sure quiet yet on how to express that myself)

The thumb extends from the hand rather than is lumped right beside it.
The middle finger follower smack dab the middle of the hand and the bones leading up to it.

-Fully flexed-

Thumb switched!

I find when trying to flex my own arm, my pinky and ring fingers are lower than the middle, you nailed it well with the semi-flexed one. Try making movements with your own hands if you really want to be realistic XD

That elbow bends at an odd angle, if the bicep is that big, it really should take up all the room till the fore-arm.

Veins dont really show up past the major muscles in the forearm (my cousin in law is super veined so I had a good study XD)

-Graspy Hockystick-

Fingers follow each other, thats why when you put all fingers on a surface it's so hard to lift that ring without lifting another.
Thus, your pinky is getting a little freaky

>.< thanks for the critiques (really I do appreciate commentary). As for the full practice, it's in my scrap folder/tab/pile. I'll def keep the things you pointed out in mind tho (sometimes I lose track tho when just doodling like this)

Also, don't draw the pr0nz until you can draw normal >_>

Try skinny, fat and muscle if you want to improve! Draw skeletons, sticks for gestures. PROPORTIONS AS WELL!

BE THE BEST YOU CAN BE GOD DAMN IT!

Art is practice practice practice >_<