Could be too low.

Hello,

I think you're either offering too much in the way of deliverables, or charging far too little.

It's got to come down to the FAST > CHEAP > GOOD triad—you can't deliver all three. And it reads like you're trying to offer all three.
(Replace "Good" with "Lots of deliverables")

Unfortunately, friends do ask designers to help out usually because they want / expect a good deal. You need to get a good deal too—otherwise you're just really, doing them a favor.