Canyon de Chelly is my favorite canyon because it's large enough to be beautiful (like the Grand Canyon) but small enough to comprehend its totality (unlike the Grand Canyon).
You weren't blessed with very good light. Even so, you could add considerable interest and drama by increasing the contrast if you're familiar with using Levels and Curve tools.
If you have images that allow different compositions, consider adding just a bit more space beneath Spider Rock and more space to the left of the face in the other photo.
Thanks for the advice, Mike and Geoff -
Mike, I like your description of this canyon. I had no idea what was even there when my husband suggested we stop on the way back from Santa Fe.
Yes, the light was not great. I had no more space for the suggested crops, but understand why those would be better. I will try your suggestions on PP. Since I am very new at this, I guess I err on the cautious side when editing the pictures so as not to make them look fake.