I think I'd like a pizza and be... oh sorry, right, the pictures... Not bad; I'm not sure a red shirt was the best choice if you wanted to really see the red hearts however. The lighting is good, but not quite there yet. I can still see some slight grey tones in your background, and, as mentioned, some over-bright highlights, as well as some annoying shadows (esp. right side (image left) of her face & shoulder in #1). I also think there's a lot of wasted room in #s 1, 2, and 4.
Just my $00.02 worth - your mileage may vary.
~John