I think the artwork is fantastic. My only major knock is that D&D goblins aren't green, if they really want to push the D&D brand they should stick with the original AD&D take and have them more in the orange range. Yes these arent the bright green that we've been seeing and more olive but still too close to green.
In my game, goblins are green, cause I'm a big green goblin fan. But, too me what made D&D goblins unique was that they weren't green, but everywhere else goblins are. I would stick to the branding and not trying to make an everyman goblin.
Yes the weapons are a bit moria movie goblin for me, but I can live with that.
I think making them look mean, pack like and athletic is fine, these look like warriors on a hunt. I like how they look to be intelligently planning a raid and they look dangerous.