Immune by Robert Rodi and Frank Quitely.

from Strange Adventures # 1.

Gray Morrow's Orion.

from Heavy Metal vol 1 # 13.

Superman vs. the Comics Code.

Go here.

Gray Morrow's Orion.

from Heavy Metal vol 1 # 12.

Jesse Bradley.

I think.

The Well by Bruce Jones and John Bolton.

from Twisted Tales # 4.

Tomb of the Gods by Esteban Maroto.

from Vampirella # 22.

The Night Holds Terror by Tise Vahimagi and Brian Lewis.

from an old issue of Halls of Horror, but I don't know which one.

edit: see comments.

Second Childhood by Al Feldstein and Jack Kamen.

from Weird Fantasy # 16.