My First Chop (prelude)

im really new at this, i dont know how to crop properly, can someone give me sum link or a tutorial or something. and is there any way to cut the top of the pic so the white isnt showing like on mine
here it is, colour change and lower.

yah

ORIGINAL
http://images.cardomain.com/member_images/2/web/518000-518999/518254_31_full.jpg

CHOPPEDhttp://images.cardomain.com/member_images/2/web/518000-518999/518254_32_full.jpg

what did u do other than paint it black and chop a little???

nothing, i wanna learn more, i dont know how to crop things properly but im guna practice at this, i just changed the colour and dropped it a bit but thats it, i posted cuz i was bored.
:)

the drop looks messy around the wheel sells, focus on a clean selection

http://www.photoshopjunkie.com/tutorials/

http://www.digimods.co.uk/tutorials/tutorials.htm

thanx KustmAce for those links

photoshopchop.com
good site

they have good tutorials