Will my hair mostly grow back and fill out? (Photos)

You have nothing to worry about, normally you need a package of 6-8 treatments to see full result. In time your hair will grow back completely.

If you stop your laser hair removal treatments now, it is possible that some of the hair may grow back, but at this point only time will tell. It is impossible to reduce a specific amount of hair with laser hair removal. Patchy hair growth until permanent hair reduction is achieved is normal and to be expected. This should all have been discussed with your prior to your treatment by your provider. 

there is absolutely no way to just "reduce" the amount of hair in an area. hair growth is on a cycle and it will be patchy and often leave "spots" of loss.  if you are goign to remove hair you need to reduce it completely or just don't do it. I suggest if you are not happy, give it 3-6 months to reevaluate going forward or just waiting.  Best, Dr. Emer.