Some of these aren’t great books but;
Kender, Gully Dwarves and Gnomes
Weasel’s Luck
Yvgenie
Talismans of Shannara
The Sword of Shannara
The White Dragon
The Kif Strike Back
Chanur’s Homecoming
The Vanishing Tower
The Sailor on the Seas of Fate
Conan
Conan of Cimmeria (both these actually give a clue what happens in the Conan stories, which is a qualification that knocks out a lot of Frazetta paintings)
Special mention to Robert Gould’s Elric covers; something about them really grabbed me.
Actually though I have to include Forest of Doom because while technically a game cover, it did get me into the book- and it’s literally the first place I’d ever seen Iain McCaig’s art.