I was more on the point that he should be bigger actually
Given the size of the person in the foreground, I mean.
I don't really get a sense of distance between the top edge of the dune and where the ship begins. It might be a play with perspective, but when I look at the painting, the guy in the foreground looks like he has 3 to 6 meters left to walk to the ship. Not the 15-ish the much smaller guy would suggest.
The sense of scale just doesn't come through to me. The ship looks much smaller to me than I imagine it's supposed to be.
In any case, I still do like the picture. Everything about it appeals to me
On a side note; have you read anything by Orson Scott Card?