I think your hair looks just fine in your pictures! I only wash my hair every two or three days, and I already have over my shoulders hair and a beard I've been growing for 5-6 years! I also have heard about getting your hair trimed often. But I don't hows it going to grow longer if you keep triming it?
Anyway do what you feel works for you and good luck!
KFace
the long haired wildman LoL