I don't mind the ironwork, but I don't love it. Is is structural, or just there for decoration? It doesn't appear to be structural, and it bothers me because it is not centered on the entry area or the stairs. I think teacat's suggestion of taking them down and using them on the left between the two windows as a trellis is a great idea, tho I would paint them white. If you decide to keep them where they are, I would paint them white. I wouldn't add columns - wrong for the house, imo. I would prefer to see the porch open, if possible. A bench to the left of the door, house numbers in a decorative plaque above it. No coach light - wrong for the style and period of the house. I think the overhead light at the door is more effective, anyway. I would also consider painting the sills on the windows in white to match the windows and other trim. I think it would give them more weight. Once you get rid of the ironwork, I think the pots will work well. But they need some greenery hanging over the edges, to connect the vertical lines of the evergreens to the pot, and not have the gap. Perhaps the bench could have a cushion with some red in it as well. Sometime I hope you might consider painting the front door a pretty eggplant or teal, or even a deep golden yellow color. It would be stunning. Then you could bring in the bench in white, with a colorful cushion in a sixties print with the door color, black from the shutters, and some white in it. At that point you might have to change the color of the pots to black.

Ah, bagworms. Yes, I'd not like that either. I'm fortunate to live in a sufficiently cold region such that we do not (yet) have this pest. Joe Pye is one of my favorites for sure. It is also the favorite to lots of bees and butterflies, so much so that in my wet meadow up north, if I go there on a late summer day, the air is literally alive with these insects. I like that effect there, but would you want such a strong pollinator attractor so near the porch? Just something to think about. Some of the Sylphiums could give you that kind of height also, and seem to hold up well into winter arou nd here. I'm sure there's oodles more ideas though. +oM

A three season room, french doors to it? Call an architect. Footers, headers, permits, roof lines, and money. It isn't just "add a screened porch" . ..unless you use the one you have Otherwise? Buy a beautiful gazebo, and put it where it best suits the view. Enjoy in good weather with screens

Could you post pictures? is this a remodel or a new build? Is there a reason why it has to be on the front of the house?