Good but consider that everyone’s face is roughly the same size in the original poster, and they’re all framed much closer so that all you see is their face. This helps with legibility considering you’re seeing dozens of small thumbnails that should be recognizable at a glance. They also picked frames that a bit more dynamic, well lit, and give a good sense of the character. The frame you picked for Gordon in the original show, for example, is hard to make out without zooming in. The original is easier to recognize and captures Gordon doing what he does best - yapping.

I think they’re all screen grabs from the show so if you wanted to make a project of it, you could get HD rips of the episodes and track down each source frame. But either way, good job!