Thank you guys, very much, it's nice to hear the encouragement.
JammyB: thanks for noticing this, I was hoping to get that effect when I exposed the negatives. In both cases the photos were made at sunrise, the background is still naturally darker, and the rising, low sun is "stage lighting" the tree and the tumbleweed. Also, in the case of the tumbleweed, the shape of the narrow slot canyon further enhanced the drama of the low angle lighting. Whilst printing, I have burned the background in the twisted tree print, and I have also done a few burns around the tumbleweed to balance it. I think the print looks better than the digital reproduction, due to the way the shadows kind of blend on the computer screen. If you have a chance, look at the images on a Retina iPad, it pops them a bit more.