The siding appears to be vinyl. It can be painted with a good 100% acrylic paint, even without a dedicated primer. It is extremely important that the chosen color be no darker than the original plastic. Plastic expands dramatically when heated. Darker colors will raise the temperature when the sun is beating on the siding. It can literally permanently destroy your siding !!!

Feel free Lori. It was on the rear of a restaurant in Newberg,Oregon and faced the West. They had used Hardi-Plank on the front of the building during a remodel, but tried to go cheap on the rear by painting over the old vinyl siding. Had they just painted it white or some medium shade of green, they would probably not had the problem. If you have ever seen vinyl siding before it is mounted, it has nailing slots which are about an inch wide. The nail is supposed to be placed in the center of the slot and not firmly nailed down. If the siding cannot move freely, it will buckle. In severe cases, as shown in the pic, it will buckle anyway as it will expand more than the room available in that slot! I am not a big fan of vinyl for the above reason. Also, in very cold climates, it becomes brittle. A stone thrown from a snow blower will cause holes in it, as my brother found out on his home.

I'll suggest complementing nature rather than trying to blend in. Shingles same as the siding -- change in texture, not color. I don't see traditional-transitional here, rather an attempt to craftsmanize a house that lacks any resemblance to craftsman. I noticed you have not started an ideabook, so no way of knowing your style. Is your builder/designer/architect unable to do color renderings like I showed above?

I like your current colors just the way they are now. The only potential change for me would be the color of the front door...maybe. If it's wood, I would probably leave it and remove the storm door. You have a very nice home!