Hey, my fellow deviants! (price update)

I'm hoping to open up some commissions and start raising a little money for my younger sister. She's working really hard with her two jobs to help make ends meet and both her and her roommate have applied for food stamps. I just want to make sure she stays fed and help her stay healthy.

So, if anyone is hoping to donate, great! My commission prices are as listed (I'm gonna make this work at about $8 and hour).

Simple sketch sheet of your pony oc busts: $5
Example:

Simple drawing (digital) of just one Pony OC: $10
+$2 for each additional character
Example:  

Detailed drawing (digital) with background: $15
+$4 for each additional character
Example:

Please note me with your preferences and it's preferable that you have a visual reference. If not, please allow me my creative freedom. And please keep things clean! For ponies, I'd like to keep my art PG. If you'd like something special, note me and we'll agree on a price. ^^

Thanks for looking!
Shiro-Jinja