After reading some reviews online I decided to buy a Guerrilla Box. I bought the 9x12 Pochade box at Utrecht today. I think it was around $169. A little pricey, but I have been really impressed with the quality. It has a piece on the bottom to be connected to a tripod. I'm using the ancient family camcorder tripod.
I decided to revisit the last Superstition mountains painting I did. This time it's on a 2 foot square canvas. I don't normally work much larger than one foot. I also decided to extend the foreground, and put it in shadow. I think it will help focus on the shapes in the rocks created by the sunlight.
The color has been lightly sketched in, over a reddish-brown toned canvas. Since there's no sky I think it makes the mountains seem much larger, and now that it's on a bigger canvas it should seem more towering than before.