Hi,can some one help me,I want to try some heads I made on uke,I did go to uke's customs folder put the head there(and renamed to head) and put some one with a 512x512 head's item.dat instead of uke's item.dat,When I entered the game,the head i made wasnt on uke,instead there was the default tori head,help me please!!

You have to edit his item.dat file to activate his texture items.
Here's an extensive tutorial on how to do that.
http://forum.toribash.com/showthread.php?t=195093

Another solution would be to make your own custom folder in which you can dump all your .tga texutres without having to edit item.dat. This would be the better way to go about this if you're a texture maker.
Then type /lp 0 *custom folder name* and you're good to go.

If you wan't to change uke's head texture, you have to make sure the head texture you made is a targa file(.tga). (Free TGA converter)
After that, you go to uke's custom file, delete the current head, and put the one you made and name it "head". Thats it