Silhouetted Heroines

I'm working on an art project, and I thought I might use some silhouetted figures as part of the design. So I go trolling around the interwebs looking for royalty-free silhouettes to use, preferably in vector format. And I quickly find the website All-Silhouettes.com which not only has many vector drawings of silhouetted people and objects, but also has them conveniently sorted. One of the files I stumble across has about 40 superheroines. Well, they're silhouettes, so 40 women-wearing-tight-clothing-with-a-few-flowy-bits-trailing-behind-them-in-dramatic-poses. Here's a sample...

And I'm scanning through them, and I'm thinking, "Yeah, that kind of looks like Ms. Marvel. That kind of looks like Hellcat. That kind of looks like Supergirl..." I figure they flipped through some comics for inspiration. Hardly surprising, really. But then I saw these two...

Now, if you don't know your 1980s Marvel comics very well, let me suggest where I think the inspiration for those two figures came from...

Nebula and Dagger. I don't know where these specific images were first used, but I know I saw them repeatedly in the various Handbooks and RPG materials that came out in the mid-1980s. I remembered them specifically because they had pretty unusual poses and, frankly, cast memorable silhouettes. Which leads me to wonder several things. First, are all of the superheroine silhouettes traced from specific artwork? Second, what about the other files from that same host; have they all been traced from existing work? Third, if they have been traced, what's the legal culpability of using them? I don't have answers to any of those questions, but it's something to think about.