My sketches - criticisim needed

[Hermoor]

Hello I have started drawing speed sketches and put them on youtube for feedback and to receive criticism so that I can learn from drawing fast. Would really appreciate it if you could tear them apart for me.

http://www.youtube.com/watch?v=t75-HZTEecQ
http://www.youtube.com/watch?v=h8boMVlyTz8