Speaking as a bloke who's been on the receiving end of this act more than once or twice...
Enjoyment for both parties is crucial to this act. Most decent men know that a large percentage of women don't actually enjoy or even like performing fellatio, and nagging away at the back of the blokes mind is, ''is she doing this for fun, because she wants to, or is it just out of some kind of duty, or repaying a favour...' And obviously, thats no good to either party.
There is nothing more off putting from a male perspective than just seeing a mass of long hair bobbing up and down, and if you do see her face, the eyes are closed. All that says is that the fellatrix isn't enjoying herself. So thats the end of that, move along to something more mutually pleasurable.
Instead, wear a scrunchie to keep the hair out of the way, make eye contact, let him know that you are into it - and thats assuming you are, obviously, if you aren't then move onto something you do enjoy. Use your hands, you've got two of them, use them both, then just use the one. Then don't use your hands at all. Don't use your mouth for a while, just your hands. Mix it up, vary it all until your find things he loves, then do that a bit more. Then stop it :) Return to that trick later. Tease and don't focus on the end objective.
If you are enjoying yourself, then let him know, let him see it, believe it. And if the giver is enjoying it, I'm sure the receiver will too.
I now await the inevitable flaming, but hey, I was only trying to help the OP to whom I wish good luck and much enjoyment in her adventures.