Well, that was soon. *wink nudge*

Ryan is... kinda attractive, really. The build works well for her. I have no real complaints.

Marcello, on the other hand, seems rather... weird. As it has been pointed out, his legs seem too long for the build of his torso... what really stands out, though, is the leg in front. The folds of the jeans in the crotch area along with its placement and weird position make it seem like it's growing out of a place further in the vicinity of his butt than it should. Simply put, the leg seems to start too far in the back of his body.
The rest of him is cool, though. He looks sufficiently gruff and Rolling-Stone-y.

The Perspective Practice... to be honest, I was a little scared when I first saw it. The tongue looked like a pair of big, round teeth to me. I think you'll see how that looks rather... bizarre.
In the end, I'm afraid Radium will need to inspect this one further and draw you a nice graph with guidelines and such... the only thing I can point out for sure is that her fingers look really small; you should have put her hands further apart and drawn the fingers somewhat parallel to the vertical lines of that... fence-type thing.

The last one seems a lot better to me. In fact: RAWR. *wink nudge nudge wink poke*
The one mess-up in perspective that I can see at first glance is the head. The roundness of the chin seems unnatural at such an angle. Mostly, it makes the head look too close to the shoulders, making it seem like she has no neck. I can't really tell whether that's just the round chin's fault or whether it's mostly the placement of the head... in fact, I might just be imagining the part about the chin. Hmm...

Well.... I hope that sufficed. *hugs*