Half a year of growth

Hey there everyone!
So I cut my hair real short on April 1st in an attempt for it to be the last time I cut my hair short and grow it out real long.
I've had long hair before a long time ago and then I started cutting it short ( I know stupid me)
But this time I wanted to grow it out for good.
So this is what I have so far:

(theres a thread on the progress in the teen forum)
So anyway, at the moment my hair has grown  to a length of 4 - 4 1/2 inches on the sides and back - and about 3 1/2 inches on the front. Not sure if that's good growth for half a year but whatever.
Anyway I wanted to ask 2 questions.

1. Should I start taking biotin? I heard about it and that it helps with hair growth and strength.

2. How long can I expect my hair to be at in march? I was hoping for the front to reach the tip of my nose by then but I dunno how that will go...

Thanks a lot for the help ion advance.

I take a super dose(5000 mcg) of biotin daily.It hasnt made any difference in how fast my hair grows.But I did get alot of new hairs all over my head.I'd say once it gets longer it will add quite a bit of thickness to my hair. I know the results might be different for others.