It certainly is top heavy and out of balance. Adding to it may not be helpful. Consider removing the evergreen shrubs and any hedges. I think the key is to try and tie in the huge sided part that looks like a giant sitting on the brick base. Paint or new siding, and the elimination of the arch over that one window would be a starting place. Do you need a new roof yet? I'm thinking the siding matched to roof color might help. Planting a fast growing tree or shrub straight out from the two windows under the overhanging upstairs would help hide the bulk of it some. A big loropetalum (Chinese fringe flower) that grows to 10' might help. Sizzling Pink is one of the taller ones. I 'm not sure how they'd do in your area. Trying to think of a way to hide the dark, shadow of demarcation between the upper and lower stories with something pretty in the center.

http://www.walterreeves.com/landscaping/loropetalum-2/

Thank you, @ decoenthusiaste Removing landscaping might be a good idea. But I am thinking more about changing the siding to stone/brick, add a large window to the top portion of the triangle and somehow adding a bit of weight to the lower portion (columns??) to lighten the top-heavy roof.

Board and batten in two different widths is a very interesting idea. I didn't even know about this style. Thank you @houssaon - I will definitely think about it. Do you think there is a way to visually strengthen the lower part of the house?

Here is another view of the house. The hedges will definitely go.

I'm not suggesting these colors necessarily because I would not have selected blue for your home, but that big blue wall needs to be divided up to make it more interesting. See house below that has contrasting gables and a louver attic vent. Wider trim around your windows would also help the appearance.

My first reaction looking at your house is the blue color, semi circle window, too small windows and landscaping. Adding stone or stucco doesn't appear to be the solution. I would tear out the bushes, match the upper windows to the lower window double hung style, removing the semi circle in that process. change the siding as suggested and choose a complementary color for the brick. Paint the trim a very light beige or gray including the garage doors. WE can't see the front door but that may possibly need to be changed.. Work on updating the landscaping

Thank you @jck910 - awesome suggestion about matching the future color of siding with garage door. I also think that semi circle needs to go.

Craftsman homes often have large decorated gables, so google for "Craftsman gable decoration" to get some ideas for how to balance a large gable with the rest of the house.

Here's my suggestion. Add horizontal trim across the middle and at the bottom of the siding section, and add angled pieces to add interest and balance. Add wider trim around the upper windows.

With the added trim, I think the siding colour actually looks pretty good.

Add a variety of lower shrubs to draw attention to the lower part of the house. It will ground the house and balance the large gable..

Paint everything above the window tops white. That will give you strong horizontals at main and second storey levels.

Get rid of evergreens put in a oatio and planter in the front by door and plant one big tree in front of house just off center of front door to shade the patio and front door and block the massive blue wall.

How does the house look as you walk from the street to the front door? That's an important view for a good curb appeal. A few more pictures would help.

Whatever I like the idea of a tree there. The OP needs to be sure to check for cables first! I wonder how many years it would take to achieve a height to block the upper storey. A quick-growing tree would be good. OP what is the closest big city to where you live?Garden zone?

@partim and @Whatever thank you! I am thinking about putting a Willow tree in front of the house, but not too close. Willow trees are quick growing, there is abundance of water in the area. I think a Willow tree would cover the upper story beautifully. The house is located near Chicago, IL. @partim I googled "Craftsman gable decoration" and there are tons of ideas. As BeverlyFLADeziner suggested (thank you) I plan to add the attic decoration too.

GREAT IDEAS!

Where I live in Toronto, willows are not planted close to house foundations because of the potential for expensive damage. Look into this before you decide on a tree. Maybe there are different varieties that are fast growing but without this problem.

Once you make changes to the upper storey you may not want to cover it with a tree! Don't plant it yet. Fall is the best time to plant a tree in your area anyway.

@partim thank you for your advice! I will be definitely careful with my choice. Once I do the makeover, I plan to post pics. My plan is to complete the exterior makeover by Fall.