OK this tutorial made by me will show you how to make a folder in music be represented by a photo on your Sony PSP.
1) You will need to open up PSP/music/ " The Name of the folder you want the picture to be for " In this case it will be Twiztid
You need to click this folder first 
Then You need to click this folder 
2) Now take a picture and drop it into that folder and you should have a picture representing that folder now. For best Results you should use 160x120.
3) After that when you load up your psp and go under music you should see a 3d cube with the picture you chose. You can put music in that folder to make it more organized.