Plagiarism would be if he claimed these photos as his own or he traced another illustrator's work.
One of the gifs already shows him swiping Cassaday, but he has traced others too.
I'm sure I saw some Spiderman parts that had been traced at some point (Charest and a movie poster), and there's a couple of ironmen (possibly including Granov and the
iron man cosplayer), and ... actually, you know what, I'll just link
this one, it's a little outdated now but it's still pretty comprehensive on both swiping
and tracing (although I would give him a pass on the dracula one, that's obviously an homage).
The Many Faces of Ben Grimm is pretty funny too (though that's only him tracing himself as far as I'm aware).
My main problem with his art isn't that he traces (though that sucks), or that he re-traces his tracings (which is distracting), nor that he traces porn (though that's distracting too).
It's that his art is lifeless as a result. There's no continuity of storytelling. If you took the words away you would have NO idea what was going on
at all because there's no flow to anything and... that really shouldn't be the case. He also really halfarses his backgrounds most of the time so they just get filled with block colours, which just makes things look worse. That's almost a shame because he
can actually do backgrounds -- some of that under-the-dome stuff in UXM was actually pretty good. If you ignore how awkwardly Mags and Betsy were pasted on top of it he had actually drawn them an interesting location to explore.