Here are "Outside Ouray" and "Eldorado Hill" in their on-loan placement in a cool office space.
They are both large-ish, at least for me, at 4 by 5 feet and 3 by 4 feet, respectively. Although I think they hold the space well, they still seem smaller as compared to standing directly in front of them. Especially considering the time required to paint something of that size. Again, at least for me.