Gr8findings---I feel the same:) I think its great to make a human connection, that way you can see who you are connecting with. It may not be appropriate for all profile pics, but I always like to relate, connect, and trust the person I am tweeting with and seeing their face is a HUGE factor in that:) Alot of us are so visual:) And your hair looks fine:)
madebymada, I am in no way an expert...so definetly try different things, personally I LOVE your profile pic, it makes me want to see more of your product!