Goblin is okay, if a bit bland. The wight looks nice and I like the mindflayer, even though it's a bit oversimplified (compared to 3e depictions, which also featured thicker tentacles). I'm opposed to the orc, though. It's recognizable for everyone, sure - give me a "big, roughly-human sized humanoid with enlarged canines" and I'll say it looks orcish. I wouldn't say it has much to do with D&D, though. It does little to evoke any comparisons with pigs, at list how it's presented here. It's more like some kind of an ogre (not even an orog), hunched over brute on little legs. Even for that, though, he has too flat and too prolonged face.
Fantastic! We were able to identify them without looking at the caption at all. (well, wight was "undead of some sort") Bang on. I really like the mindflayer. You captured it perfectly. And the goblin is fantastic.
Orc isn't bad, a little less humanoid then previously depicted. Same with the goblin I reckon. But I've seen goblins so many different ways it's hard to pin them down to one depiction (especially the Akki of Kamigawa). I think the problem with the Mind Flayer is it is not gaunt enough in the face ([link]). And for the wight, seems a little too solid to be undead ([link]). The again, these types of images are made to look smooth and solid, rather than gritty (which most of these creatures would be normally shown in that way).