I had a bit of spare time, so I thought I would have a go at #2 in PP. I am by no means an expert at this, but the result is closer to what my mind's eye said the photo should be.
Basically my steps were: (This is probably child's play for most of you, but it is uncharted territory for me)
1. Select the chair using the Magic Wand
2. Invert the selection
3. Create an adjustment layer using the selection
4. Brighten the background using the levels layer
5. Clone out some of the dirt highlighted in Step 4
5. Save and breathe deeply into the paper bag
Notes to self:
I missed a bit of the chair in the initial selection: double check over the entire image in future
Make sure the background is as clean as possible before taking the photo
Get another Umbrella, or maybe a diffuser so I can soften the third light
Play more with different angles. I suffered from Tripoditis on this shoot
Learn more about PhotoShop.
Your C&C more than welcome. In particular what could I have done better in PP?
EDIT: I also tried to get more detail in the chair itelf, but I just mde it look muddy, so I discarded those changes (Hooray for multilevel Undo!)