I want to say the shines on the faces under the eye are a common RMVX thing, though it may be mistaken for a tear, maybe. I think the one with the big, blue tear is the only one meant to look like he's crying.
It looks more like a serious dude then a downright sad person to me.
1.Looks surprised to me, or normal. 2.Looks like he's either in pain or surprised also. 3.Looks smug, and happy. 4.Looks like a kind of "heh" frown, not really sad. 5.Looks like he just got asked out by the new hottie down the block. 6.Looks like he's crying a big, blue tear :'(. 7.Looks like a simple, eye-closed thinking or sighing expression.
But that's just what it looks like to me. It all depends on who is looking at it, because everyone will see something in a different way.