How to make a head texture in 3.8
First go to Shop.Go to account and then go to Textures. Find Head Texture.Buy it if you don't have it.You need a program like GIMP.If you don't have it,Paint will do.Make a new picture and make it format 128x128.Then See the Pictures below by number(1-3).I suggest you make the Picture Files GIF format.Then go to "Textures" in the shop again.Find head texture.Then click Browse and find the texture you made.
Example: F:/Pictures/Smile.gif
Congratz ! You just made your first head texture.