Asking for Critique

I was just wondering if I am doing this correctly or if there is anything I can do better. I have just started, I've been on and off again trying to practice, some days I get to busy to do it.I want to where my errors were and what I need to correct if anything. I'll take any critique anyone can tell me. Thank you! :)

(You can click or copy and paste the links to view the photos)
https://drive.google.com/open?id=0B8d_2jtJFWJ3alF2Wl84YkF6TWc
https://drive.google.com/open?id=0B8d_2jtJFWJ3ang3ajNGdUlndWc
https://drive.google.com/open?id=0B8d_2jtJFWJ3cktMRWFFR3ZaWTQ

hey
probably not the best person to give criticism but you might want to consider using curves instead of straight lines

for example the arms might want to be a curve if you want it to seem more smooth or elegant or a sharp point if you feel like the elbows are locked in

also I found it helpful to use 1 stroke than 2 for the limbs

later on you can try out doing extremely exaggerated poses and just ditch trying to be accurate... or at least this helped me out quite a lot

but yeah honestly I'm struggling myself and, again, not the best person to give criticism

good luck

some of mine
https://cdn.discordapp.com/attachments/101220500197343232/375896583059013632/New_Canvas_11.jpg