I really like the composition of the sketches you've shown so far. Something about it really appeals to me. Maybe I'll figure out what it is as I see more of them.
I find it interesting to see Libra depicted as a male... though I suppose it is considered a male cardinal sign? I always thought of Libras as hermaphrodites, balancing male and female. Most of the Libras I know come across that way. :)
I like the contrapposto of the figure on the top sketch--lends to some nice contrasts between dynamic movement and the stability of the platform.
I agree with Lisa regarding the contrasts shown in the top sketch. I am in awe of both of these, as most of my scribblings are nowhere near as coherant or "polished" (as scribbles go, anyway)