What immediately comes to mind is change up the fireplace mantel. The art on the walls is enough, do something different on the mantel, but I would keep it simple.

What a beautiful room! Great bones. It sounds as if you know what you want. My advice is take your time "finishing" this room. If you want symmetry on your walls, do it. There's no law that says you must. I find your current wall colour very pleasing but if you'd prefer a bright white, go for it. Drapes and wallpaper will offer the biggest visual bang for your buck (vertical surfaces usually do) so I'd take my time considering my options there.

I don't know your room's dimensions but I'm having difficulty imagining adding a hutch or a secretary in that space. Even the end table with the lamp seems a tight fight on my screen. (Are end tables besides the sofa necessary? I could see one between the chairs.) I like a room to breathe and would even remove the table under your window. Love the artwork above your mantel but I'd be tempted to want space between the mantel and art to better showcase your beautiful mantel. Good luck. Again, take your time. With two little ones, life can get plenty busy and push decorating to the back burner. :)

Personally I think window treatments make a room. You could do a simple roman shade. Look at theshadestore.com they have lots of beautiful fabrics

Beautiful room! The thing that really jumps out at me is the placement of the art. On some walls, the proportion is not quite right or the pieces feel crowded together. I like the suggestion above to put everything on the large wall and create a gallery. As it is now, the artwork doesn't seem to be displayed to best advantage and makes the room feel a bit disjointed.

You can visually counter balance the fireplace by using a secretary opposite it.