hey, artsyrm. i like your drawings, the lines are fluid and confident, and the poses look good and readable. great job there. i also like your hands, they're very hard to get right and yours are proportional and readable.
however, they do look kind of flat -- not necessarily a bad thing, that can be used to great effect, but i'm not sure that's what you were going for.
there's something called construction -- you might try applying that. ie, thing about the masses of the ribcage, hips, etc and place them before you go for the contour -- or outline -- of the figure. andrew loomis was a bit of a racist (he drew in the 1950s, lol, sorry to bring politics into this), but he has some very good books on construction. fun with a pencil is for absolute beginners, so you may feel bored doing those exercises, but it may help you start constructing forms in 3d. his books are online as pdfs, you can access them for free.
when skin overlaps skin, there's a very signature y shape that usually comes -- study your references and try to look for those y shapes where arms meet the torso, or lower legs to upper leg, neck to jaw, etc.
overall you've got a great start, the figures are appealing, readable, and well-done -- just a bit flat. keep up the good work.
