So I thought Id give some advice. These have worked for me, they may not work for you. Don't take me too seriously, I'm not a serious person. Enjoy.
The Head:
Hair:
Ive personally found that short-medium hair is the best. Not too much maintenance but can style quite easily.
Dont buzz it off unless you're confident you can pull it off. Its a style adopted by butch lesbians and you may get percieved to be one.
Dont preen it. I personally found the longer i spent doing my hair, the more feminine, people saw me.
Bedhead. Always works. Ive adopted this style, it seems to show laziness. BUT Dont try if you're attempting to get laid it minimises your chances greatly. (unless you're hot, then you're fine regardless)
Really long spikes. It looks cool until you take someones eye out. (and then they cant see how cool you look)
Hair colour. Try to stay natural. Straight guys dont tend to colour their hair pink/blue/green etc. If you're not straight however go for it. The world needs way more colour!
choose a hairstyle for your face shape too. Certain cuts suit certain faces!
Glasses:
Dont oversize them, korean girls have set a trend with big black square glasses. If you're pre-T, this style of glasses may harm your passibility. If you can go for a slightly smaller frame,(about 1.5 inch)
Contacts can make you pass better (but not always)
If you need glasses do wear them. If you accidently fall into an uncovered manhole because you couldn't see it, the paramedics may unintentionally out you.
Skin:
Look after it, Acne is a pain in the ass but if you can, get it cleared up. (will increase chances of getting laid by sexy people - GUARANTEED)
Facial Hair:
I'm all for beards but caveman is so not hot right now! Trim it now-and-again.
If you're gonna use the fake stuff, glue it properly and don't stay out in the sun. Don't ask me how you're going to explain why your moustache is sliding down your face like a slug and why your beard has started swimming laps in your margarita.
General:
You may not like the baby-face now but when you're 50 you'll have so many young admirers. Plus cheaper bus/train fares! Cheaper entry into theme parks. Order happy meals from McD's without being judged! Free stuff from nice people (but stay away from the strange ones giving you white smarties, they're not really smarties!)
SMILE - confidence will outshine the haters and make you feel good. (and if you're ever down say bubbles in an angry voice. You wont be sad for long!)
Hope this helps. Please take it with a pinch of salt. Feel free to add or change this list.
Yours
Gentleboy