For the antelopes and to darken further the ground and vegetation, I added black to my palette (apparently I botched the thicket on the left in the process, and had to turn it into a mound):
I removed the tape. Here is the resulting painting that occupies some of the 21×13 cm page of a Moleskin watercolor book:
I learned that the paper of this book isn’t thick enough for too much paint/water, and that it was too ambitious to render the light on the ground and around the animal immediately under the sun. At least, it’s still graphically appealing!