Welcome to Gaia! ::

I'm sorry for this, but I give you a...four. Don't get me wrong, your art isn't bad, just a little...under trained and practiced? Your drawings show a lot of potential for growth & development, which is really really good.
Well, your anatomy is off quite a bit, but don't fret: most people start off and take a while to leave that stage. For your drawings, maybe you could look at photo's for reference, or even have someone pose for your drawing to get it right. It would help greatly as to finding how say the arm would curve and bend at a certain angle, or a foot would be positioned. For practice even, just snatch a few reference photos, and try drawing the poses.
Now, with your lines. They're a bit hard and straight. Ah, I remember when I did that all the time...Well what you might want to consider doing is lightly sketching your picture first. Don't draw long lines in one stroke, try bringing your pencil down several times to do it, without putting heavy pressure. Then, you could try taking a pen over the lines VERY carefully. Add an eraser to get rid of the old pencil lines, and voila~! You have a clean, soft edged drawing. With practice of course.
Now, this is more of a tip then critique. With shading, please don't say 'oh i can't do it, it's impossible' or something along those lines. Anyone can do shading dear. To learn how, tke scrap paper, start at one end, using light pressure with light strokes, and as you go along the paper, gradually increase the pressure to make it darker. Once you have that mastered, maybe try doing it with a circle, using a reference to check how shading falls upon it. Then, last but not least, try it on a drawing of yours, still holding a reference possibly to check it.
With the shading though, sometimes you may want to do it on a drawing without pen lines, but just a simple sketched drawing.
Well, overall, your art's pretty good for novice level, and with practice, you should be able to make it amazing. blaugh