Looking good, Lane.
Just a thought, are you using RTE for any of these? The sand seems to be blocky and has very little definition in 2 of them. Ray tracing the planet surface doesn't really work well with displacements.
You should probably deactivate the glittering in the sand layer too as you seem to be picking up highlight specks in places that they shouldn't appear, I imagine you have a secondary light source close to the foreground that's lighting them up in funny places. It's not a great sparkling function that will fit into any scene as it relies on direct front lighting to work best.
You could maybe raise the diffuse colour of the trunks to a higher level, even above '1', if it isn't already, to get more details on the trunks in this dark setting, if the lighting isn't doing it from its current position. Raising render contrast and/or exposure might be good too.