Five foot standards I assume... so i'd say it's 2ft.
As said above, jumping ahead of the motion... as well as it looks to me like your heel came up a bit. Make sure to sink your heels into your stirrups over the fence.
I think I see your reins flopping about in that picture, although can't be sure. If the reins are that loose, this means you have no contact going over the jump. You don't want to be yanking him back with your hands (i.e. No release) but you do need some contact going over the jump to have some sense of control.
I copied the image into word and enlarged it, first thing, if I am seeing that right, your reins or WAY to loose, when you have to loose reins, it is going to be very hard if your horse decides to bolt after the jump to get control of him/her.
Like mentioned, you are a bit ahead of your horse, and your heels have seemed to pop up a little, maybe because your stirrups look a bit to long, but some people do better when they are like that, but some like them shorter.
You could put your hands up a bit, and sink back in the saddle, rather then getting ahead of your horse over his/her neck, stay more of in the main seat of the saddle, get out of the saddle, but not so much over the neck, if that makes sense. Other than that, you look pretty good!