Death Note Sketches

Umm.. Just wanted someone to rate my Death Note sketches.. I'm still not quite good at this so i need some advice on what seems wrong >.<
Please rate.
(OR should i post this at Anime Section instead? o.O)

Light Yagami/ Ryuuzaki (L)/ Ryuk

http://img501.imageshack.us/img501/7...tyagamizb4.jpg

Misa Amane

http://img501.imageshack.us/img501/2...anemisajb9.jpg

Ryukazi (L)

http://img384.imageshack.us/img384/9...uuzakilsd3.jpg