I feel you have done a good job! Some minor things might be considered..
I thought the guest book was a bit bright.. If they didn't mind I would remove it because it is distracting.. Darkened the dress a bit and smoothed it out (removed noise)
A good starting work flow is shown here:
http://retouchpro.com/tutorials/?m=show&id=255
OL Baldys
Basic Photo fix work flow
Duplicate then un-select original layer
levels layer RBG channels LEVELS ADJUSTMENT
select all, copy merged, paste
Straighten if necessary
check layer channels for the best ratio
Channel Mixer (set to monochrome)
select all, copy merged, paste
dust and scratch filter.. Alt click (for black mask) paint with white then continue...
select all, copy merged, paste
Sharpen
select all, copy merged, paste set to luminosity
copy layer after levels merge move to front set to color(to put back color)
Heal or clone
Noise removal if needed
Curves/color corrections (like in this case darkened dress some)
select all, copy merged, paste
final pic