Side by side, lining up my shoulders and drawing a line so that you can see the difference.
As you can see, there's not too much growth between the six months, just about an inch. Since my hair grows approximately half an inch per month, I had expected three inches of growth at the end of six months. So why has my hair only grown an inch? Simple. Probably because my hair is in telogen phase, the phase in which hair growth stops. Read more about the hair growth stages here. The hair also grows a bit slower in the winter time. Less sun, less heat. Think about a plant. When would a plant grow fastest?
Here's what one year of hair growth looks like!