The first one (for the Mysterious Tower) is a little too cartoony for my tastes, but the second one (for Bloody Jack's Gold) is 100% perfect old-school Erol Otus. Nice to see he hasn't lost it. I'm almost tempted to buy it - if only it wasn't
d20!
I collect as much for the artwork as for the content of the old stuff. At some point, I'd like to start an archive that lists each piece of artwork, and artist, in every old TSR product. It'd be a great resource. I'd probably buy some other old products if I knew they had a great Erol Otus in them.