Well it definitely does look good, but I think a little scalp make-up would make the blend even better. Also, I would be slightly concerned that your real hair might get wet unexpectedly (in the rain or from sweating) and the contrast between your hairpiece and the real hair would be a giveaway.

My guess from these pictures is that you don't have much real hair to work with, and unfortunately in the next couple of years you may have to reduce the density of your hairpiece or go for a three-quarter cap.