I am a barber.
- IMHO you still have plenty of coverage if you want to keep your hair long.
- IMHO however you would look just as good in a tight skin fade, a buzz style, or a razor shave. A shaved head is just as legitimate a hairstyle as any other haircut!
Whatever you do, be sure to follow the 30 day rule when making a dramatic style change. If you don't give yourself at least 30 days for your brain to get used to a new "mental image" of you, you will never know if you really like the style or not.
If you shave your head and after 30 days you decide you want to grow some or all of your hair back - no problem. It is just a haircut! It is not a like getting a tattoo!
You owe it to yourself to give it a try.