This question isn't as broad as it might appear at first glance. I've seen drawings of dragons, Dwarves, Trolls, and Hobbits by Tolkien, and I'm primarily interested in only a few other races. He was a prolific writer and artist, but he seems to have shied away from making too many illustrations featuring animals or people. Perhaps the only imagine along these lines that I have been able to find are these:
The Dragon Glaurung.
Smaug and Bilbo.
Even more Smaug.
Bill, Tom, and Bert, the Trolls, with Bilbo hiding in a bush (left background), a bunch of Dwarves in sacks (left foreground), and Gandalf casting a spell (right).
Bill, Tom, and Bert again, with a Dwarf in the foreground.
Bilbo at home.
The races I am most interested in seeing are as follows:
These are the races/species I am most interested in seeing, although I certainly won't complain if you find pictures of other races/species.
Did Tolkien ever draw any of these creatures and races?