One way
for the yellow try Enhance>Adjust Color> Hue & Saturation>edit (drop down) choose yellow> drop your saturation and play with the lightness.

Oooh yeah, I was going to say just the same thing as estir_bune about the yellow.

For the shine on the face, I would do a brush using the same color as the nearest "un-shiney" part of the face, maybe at 40% opacity? Then just slowly go over it, to reduce the shine. I just had to deal with shine issues on the engagement pics I took of SIL and her fiancee - he has a bald head so I had a lot of shine!

I use the clone tool to get rid of shine just resample often

Excellent! I've never paid attention to that drop down menu before! The bride is no longer yellow. Thanks girls!

OMG Tali!!! That opacity thing is awesome! =) I've never tried that with a brush before. What a great tool to take out blemishes. I've cloned, but sometimes that just doesn't look right. This looked perfect!!

this tutorial was made for the bottom photo:
http://www.photoshopessentials.com/photo-editing/dodge-burn/

That tutorial certainly helped brighten up their faces. I wish I had noticed the bright glare on his head though, it's like a big white streak. I don't think there's much that can be done about it. =) Their faces are much brighter though.