I think you've hit a delicate balance in this shot that I'm often aiming for but rarley find. The trick to make the foreground not going silhouette without having the low sun's surrounds turn into an ugly blow-out.
You do have a blow-out area in this shot of course, which is unavoidable, but it is still mostly circular and looks natural. I usually get either no foreground definition or a ghastly elongated blow-out shape above the horizon. This is also something that's hard to judge on the LCD...
I've tried flashing the foreground with limited success. In the end, textbook sunset shots seem only possible with dense ND grad (or even sunset

) filters.
Cheers
Steffen.