Thank you for sharing more of your pictures taken with the *ist (and thank you for having given a look at Nikon DX lenses at the PMA).
That last picture of you look good to me (the others too actually). To my untrained eyes, that noise in the shadows look pretty much like the grain one might expect from good old 35mm film. Could it be sharper? Quite certainly but it doesn't look wrong to me. Beside, the colors are great.
regards
Seb