2 & 3 are really good... but they look a little light ... like maybe white balance issues..? I'm not exactly sure...
1. the colors are pretty dull
4. aiming down at the subject like that kills the shot IMO
I'm fixing to get the XSi with those same 2 lenses ... and I must say im really looking forward too it after seeing these pics... how far were you zoomed in on 2 & 3 ? how much lens did you have left?