I think you've got a great start here. But I think the right side of Okazaki's face is a little off. Try not making the curve in his cheek so square as it doesn't match properly with the other side of his face. I know it's a 3/4 view but the squareness makes it look of still.

As well try giving the fingers a little more space, they look too close together compared to the rest of his hand which seems a bit wide. His shoulders also appear too wide in proportion with his head. Try slimming them down a little bit.

I like the background, it's very interesting but I'm a little confused as to whether or not Kamui is supposed to be sitting on that back ledge or not. Also, I would try adding some more darks and highlights to their hair, give it a little more contrast than it has now.

Hopefully this helps you out a bit. I know hands and anatomy in general can be tough. :3

this will be my first time using this critique system. so i apologize in advance for any mistakes i may create.

wonderful work! i can see improvement in it
i love the detailed chains and ware house background you made for this drawing.
not to mention your great coloring too. your character's hair always look so lush!

there are just some mistakes on the anatomy i would like to point out. i will start with the chained boy.
i read in the comment that the story involved bondage correct? the expression in the drawing is as if he is smiling. maybe you could give him more terrified look to suit the story more
and i think he is missing a toe on his leg. i can only see 4 toes
that's all on him. beside that, i just love his pose.

second guy, i think his neck is a little bit too long. and the shoulder a little too wide. it makes his head appear smaller than the body.
and i think for his shirt you can add more ruffles to make it look more real.

other than those little anatomy mistakes, i just love this drawing! this is one of my favorite work from you. keep up the good work!