I definitely like the new as compared to the old.
As far as some Crits:
I think overall, it's kind of flat, you have some shading on the piece, but it isn't consistent. I think you need a more defined light source on the head and arm that's on the left side of the piece. I'm guessing your lightsource is coming from the top right, so the left side of the head and arm need to be shaded accordingly. As far as the anatomy, the only thing that really sticks out to me is the arm, where it comes in to the torso near the pectoral and the elbow. It just looks odd to me how the arm curves in up towards the neck, and theres no clearly defined bicep, to worsen this the arm almost looks like you're looking at it straight on, yet the elbow almost comes in to the opposite side of the arm, almost like he has his elbow on the opposite side of his arm. I think if you push the elbow back, add some shading to the left side of the arm, that help make the elbow have some depth, and manipulate where the arm comes in to the torso at the pectoral it will give it a more "fit" look. That's all for now, give you some stuff to think about, I definitely would like to see any revisions

- Dog