I would say: Go for it, put it up at the local coffee shop, and if someone acts like a douche, let them. Everyone likes different things when it comes to art so you won't be able to please everyone anyways. I don't know if anything happened between you and that person that was your best friend but if you just drifted apart maybe try to hang out with her again? Like start a conversation and catch up?
Well I've thought about that too, maybe I will try that at least, I'll have you to thank for (if I can get up the courage to do it), for your kind words and encouragement ^_^