I don't think the color is off by much, its a density issue mostly and I also agree that maybe the piece is too large for your balding area. (but not sure about that, would have to see you without a piece on your head, but its appears to come down too far on the sides.)
grow your sides out a bit, that does NOT mean you cannot wear your sides short, but the stylist will need SOMETHING to blend into when doing the cut-in...so its best to have a little extra to work with.
I also agree that the front will look awesome once you get a few kinks worked out. you are on the right track!! don't be discouraged...some minor tweaking and you will be ok.
DebbieS.
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