That second one is a favorite one of mine, Tigers of the Sea, a Robert E. Howard collection of stories featuring Cormac Mac Art, The Gaelic warrior.
When I was working for Gary, TLG had a verbal agreement with Jones to use his art on the covers of the Castle Zagyg series. His art is seen on Volume I: Yggsburgh, but by the time I was on board and Volume II: The Upper Works was finsihed, they lost communication with Jones, and rthe deal fell apart. It would have been nice! His work was amazing, I agree.