No offense but I don't see any of the LBT characters in them.
"Petrie" looks like he's on crack. And what's with the spike belt and skin tight pants? That's not what I think of when I see Petrie.
"Cera" looks way too pompous and bitchy. I know this is how she is(even if she's gotten better) but this girl looks like she'd turn on her friends if they no longer seemed "cool" to her. The actual Cera would never do that.
"Ducky" is the only one that seems even somewhat similiar to her dino self.
Why does "Chomper" look like a depressed little punk kid? Chomper is anything BUT depressed. In all of his appearences, he's bubbly, cheerful, optimistic, innocent. The complete opposite of how this kid looks.
Giving "Spike" spikes does not make me think of Spike. Try saying that three times fast
And finally, what annoys me most...
"Littlefoot" is a bookworm?! How?! What part of Littlefoot's personality screams "bookworm"? Littlefoot is adventurous, rebellious, eager, always ready to play. Now does this kid look anything like that? I'm not saying bookworms can't be adventurous but this kid sure don't look it. He looks like the kid you'd see at recess, sitting by the flag pole, not talking to his peers with his nose in a textbook. Littlefoot is the kid you'd see at recess playing even after he was pooped out.
As OCs, they're pretty good. But they are not the LBT characters as humans. I'm terribly sorry. I'm not trying to be a jerk and if that's how I seem, then again, sorry. I'm just a tad skeptical about these kinds of fan art. For me, if the subject matter is "Such and such characters as humans", the personalites have to fit to a T. Otherwise, they're just OCs.