Lovely!!!!! ^_^ I like the pose work that you've used. It shows how they've grown as partners together and their camaraderie.
The fure looks fantastic and shows the details and effort you've put into it as well.
The lighting is very well done, showing great perspective and angling. I agree with the other commenter about how Nick's left side of his face is a little off, however, for a first time with posing that I've seen from you, you're doing well. So keep up the great work, and as you put in the effort on drawing these two, I know you'll improve a fantastic amount!