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These images were picked up from a posting on Rob Liefeld Rom homage covers posted by Ptor from the Santcum Sanctorum last year March 13. So although the fan/sketch art at the top of the posting may be the first ever art for Rom by Liefeld it would seem he's had Rom on his mind for a while now.
Also, some new Rom originals just turned up on ebay recently. They're not bad for the most part but the Randy Green piece is my favorite: http://www.ebay.com/itm/ORIGINAL-ART-AVENGERS-SKETCH-COVER-variant-ROM-SPACEKNIGHT-BY-randy-green-/330961849487?pt=LH_DefaultDomain_0&hash=item4d0edd0c8f