One I'm thinking of quite fondly right now is that issue of Wonder Woman where she's being chased by a sphinx that's shooting lasers from its eyes.
I'd post a pic but using my cell is a bitch right now...
1 Kings 21:23
And of Jezebel also spake the LORD, saying, The dogs shall eat Jezebel by the wall of Jezreel.
Just some of my favorites.
Plus many other hand painted covers to Elfquest vol. 1
Pretty much all the Twisted Tales covers. I like this one in particular but with Corben and Stevens doing covers, how can you not like them all? As a matter of fact, any Stevens or Corben cover.
There are many more. Anything Frazetta did. Many Bronze Age mags had awesome covers.
Three covers with different directions...
Another great Infantino/Anderson cover that has had a big influence.
A beautiful Matt Baker cover (it's all about the angles).
A classic Mac Raboy victory cover.