I have a SD700 and found that if I use the vivid colours settings I get a picture with colours that pop . As this camera also tends to overexpose I have used -1/3 or-2/3 compensation which tends to show better highlights . I also turn the aaif off although I dont know what impact this has on the face recognition settings. I would assume this is similar to the SD800
Dont forget you access these settings via the M settiing. Enjoy!