Hiya Kat. Um well Im sure an custom image can be made, some with any graphics program and then transfered. If your an artist and think its worth the effort by all means.
But until that happens you can easily go to your profile (My profile) and down at the bottom you can add and edit avatars! Go to the file or just hit browse: My documents: and open your pics file: and find the pic of yourself you want to share: right click on pic ( i assume you have XP )
its easy from there
You can use scanner too, for you custom art avatar. browse My pc, C drive too and any image you have thats not too big can be an avatar
k hope that helps
If i missed a step im hope someone in forum will interject
Ps i hope u do decide to use your pic curious to match face with your vioce