Number above the door, different color planters, "live plants" in planters.  New brass strip on screen door? $10?

I sold a home based on the front door, my client when we pulled up stated if the house is 1/2 as nice of the front door "wipe out the contract" minor details can make an impact have a great week.

New numbers above door, you moved the welcome mat, painted the planters and added flowers. Our guess is $17.

The second photo shows the house number added over the door, clean steps, painted planters, live plants, painted light fixtures, and painted trim.  My guess is that it cost $25.00.      

In addition to what the others have mentioned, I'd say you added a new flag as well. Total cost under $40.00 ... and a good example of how much difference small, inexpensive changes can make.

Your dollars spent seems to be spray painting the urns and adding live flowers + house numbers.  It doesn't look to me like any painting or power washing was done, or new flag.  Same door mat, centered.  Paint $10, flowers $15, numbers $10 = $35.

Great job everyone!  Here's what was done and spent:

Swept the steps, cleaned off the door mat
Hosed down the area to clean out the cobwebs and gunk out ($0)
Painted the wood trim around the door ($0 - homeonwer had paint in the bsmt)
Added house numbers over the door ($5)
Spray painted the urns ($3 for can of Kryon)
Added "live" plants ($2 - incredible deal at IGA)
Replaced the flag with a new (albeit cheap) one from Michaels ($5)

That's a whopping grand total of $15!  The homeowner will also polish the brass, but hadn't gotten to that yet.  Congrats to all who played the game! 

It's amazing what a few fresh flowers will do!

I agree Kristina! Nothing turns buyers off more than dead flowers (plus it's bad feng shui!)