New to Photoshop just some studies

[ATIPdante]

hey all im new to all the photoshop stuff and decided to have a go. please it would be great if you can give me some tips and things to improve.... thanks

http://i200.photobucket.com/albums/aa24/atipdante/strange.jpg

http://i200.photobucket.com/albums/aa24/atipdante/sketch.jpg

http://i200.photobucket.com/albums/aa24/atipdante/facestudy.jpg

http://i200.photobucket.com/albums/aa24/atipdante/strange2.jpg

http://i200.photobucket.com/albums/aa24/atipdante/firstpersonviewstudy.jpg