This is an Interesting view and i like the comp overall.

(I also agree w/the others about the odd blue/green cast in the center that also looks oversaturated)
I also like your thinking here, but the execution might be off to me.I just did some quick play using a depth of field calculator.... A Flexible Depth of Field Calculator
If your goal was the most sharpness from immediate foreground to infinity, then you should have focused on the nearest rocks in one of the exposures, not the center one you focused on. If that was the goal then 2 exposures were indeed necessary.
If you are okay with the current level of sharpness, you probably could have achieved it in 1 frame using a higher F stop as tim suggested.