I like the self portrait comparison, it really shows your progress. The new one has some really slick lighting details around that near eye.
With studies like the final post, I recommend using a flat colour similar to the image background, instead of a flat grey. When you work on a darker colour the values are different and you'll over/under compensate
If you slap your image on top of the old one, you can compare the colours and see the difference much more easily. and it looks like he has an entourage .