Ramos isn't in the same league as Warhol or Lichtenstein, but he's pretty well know in the fine art world for his pop art.
Wiki entry
And his intent, just like Lichtenstein, was to exhibit publicly, his works are quite valuable
Ramos Green Lantern sells for $600k
That's rather interesting.
The Green Lantern painting, as with the Superman and Atom, is quite dreadful.
Some of the other works, I see from your Ramos Wiki entry link, look really good.
Go figure . . .
That GL is AWFUL and it's sad that it sold for that much (though I guess not too sad for the seller)