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Eric S.I agree that some portraits are less interesting then the action shots, but there are some worth mentioning. Tinker, Cobb (green/red), M. Brown are three that come to mind as exceptional cards. I have not had more difficulty finding portraits in my endeavors but it depends on who you're looking for. Many of the high end cards in this set have portraits and those with red backgrounds show defects very easily as well as fading which I think can have a large impact on the visual quality thus making the nicer cards in higher demand (only my opinion). There are some resources on this site as well as T206.org (click on the "links" button for more) and Scot A. Readers publication that can help answer your questions.
Good luck with the HOFers.
Eric