Photoshop makeover for our house!

I love This Old House and their feature Photoshop Makeover is a favorite of mine.  I am too lazy to submit a photo of our own house to them, so I just made one of my own using SketchUp!  I already had the model of the house in correct proportions.  We want to take out the 1980s wrought iron porch supports and railing, remove the unoriginal section of roof to the right on the porch and put up some period porch supports.  (I may or may not have been procrastinating working on summer internship applications when I did this. Just kidding NASA and NPS.)

I am pleased with the results.  My fears of brick columns looking out of place seem unwarranted.  Specific questions include:
1. Does the aspect ratio of the columns seem appropriate?  The brick portion is 16" square in the model.
2. Is the taper of the upper section of the columns seem appropriate?
3. We may get a new roof in the next few years.  A white metal roof would be good for our thermostat, our wallets, and our planet, but might look ridiculous on a white house.  Thoughts?

Please comment below!  Thanks!