Family Portrait Jelp with Settings

[littlevoice]

I took some family portrait shots last evening, and the sun started setting fast! I used my flash +1/3, ISO 400, 50mm, f4/5 1/60. Can anyone help with what settings work best for outdoor shots when the sun is almost down? Please view these two shots and let me know what you think. Your opinions are greatly appreciated. (this was not a paid session, just practice)
http://i411.photobucket.com/albums/pp198/heathiebug/petelance.jpg

http://i411.photobucket.com/albums/pp198/heathiebug/lanceemily.jpg