Yes keeping the lizard would be sweet, but the reason I think it's mean is because if he's a wild lizard, which he looks like it, he's used to running around and not being in captivity. If he's wild I think it'd be better to leave him in the wild.
Most lizards people catch often die sooner or later because they don't get the proper care.
Just sayin
I can't really tell what it is, like Aznrainbowdime said, maybe a closer picture would help?
I don't think it looks like an alligator lizard though..