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I think the reds and yellows look good together. I would make the last room a yellow color. Just stick with those two, don't add a 3rd color.

I agree - the yellows and reds look great together and would make that last room yellow to tie it all together and balance it out. If you want to add a third color, you can add it in small amounts through decor - if you use blue, it would be a nice primary color scheme and give a little contrast and punch. If you want to go more subtle, stick with white/cream.

I have come to the opinion that since a dollhouse is viewed as a whole, the color scheme/wallpapers/rooms should be in harmony with each other and I think you have a really great start!