Well, the reason from, oh, 2016 or 2017 when I posted the existing ones is the fact that there are so many. That is, in addition to the several I had done back then, which was quite a decent load, there were still nearly 40 more to do... I finally posted these remaining ones to my Later Works page, though, and they indeed are enjoyable.
This pleasant Richard M. Powers-fest has pushed the number of images in my Heinlein Cover art galleries to more than 1,000. ONE THOUSAND. Wow. That seems like a lotta pics to me, and of course they're all straight from my own collection, nothing scrounged from elsewhere online. This is a funny hobby, I guess...but fun, too!