Well, first of all welcome,
on to the criticism part:
Anatomy is not good. Heads are extremely large, their (especially his) necks are very long. If this is a stylistic choice, your free to do that. But please do mention that in the future... Still Id do something about his neck, it is really ridiculously long, especially with those low shoulders.
Another point has to do with that sweater... Its all very nice, but I dont think it really adds to the picture. It makes it harder to really look at the picture, which I guess is no problem for some poeple, but I dont really like it.
Id suggest only using these textures and stuff as long as they add any value to the drawing, never make the drawing dependant on the texture. Look at it like a picture frame (not that great of a comparison, but it works), It can add something to a painting, but it must never distract from it. And in the end, it is about the painting, not about the frame.