I was beat to the punch, but here's another shot at anatomy red lining:
Overall I think the way the character is rendered is really nice 
but as others have mentioned, the anatomy is a little off in places, and I think that's the only thing that stood out right away as "off" to me.
For my redline, the notable adjustments are:
I moved and rotated the whole head a little bit. The character's neck doesn't really seem to fit properly in the original version. Using the chest as-drawn as a guide I located roughly where the neck should be, and moved the head into place accordingly.
For the arm at rest (on the right of the picture, or the character's left arm) it just looked a little too far to the right after sketching the torso for the above point, so I roughly located the shoulder and draped the arm down accordingly.
the arm of the glowy magic hand seems a little strangely located- the elbow is out of frame, but the pieces that we do see (upper and lower arm) don't seem like they connect quite properly. A trick I learned many years back is:
you can draw the hand anywhere you want it, then locate the shoulder and wrist and draw a line between them. To find the elbow, you can turn that connecting line into a T and at the bottom of the T is where the elbow goes. It doesn't always work perfectly and you have to be conscious about how long the base of the T should be but it's a nice trick nonetheless.
When trying to get my hand in that postiion in real life, it seemed as though the elbow maybe wanted to go outwards as I've sketched rather than down. Although I think that @TedGravesArt 's version also works! The hard thing to get right, then, is the angle that the hand is facing. The reason that I defaulted to the "elbow out" version is because in the original drawing it looks like the outside of the hand is angled towards the viewer a bit and it was easiest for me to achieve that effect from that angle... but that's a small detail in the grand scheme of things xD
edit:
here's a quick example of the "T" trick. the T's in this case are in blue, and- along with using my own arms as a reference to get a general feel for where the arms/elbows should be- quickly let you get the arms approximately correct
