bikini car sunset exposure/fill?

Hello,
Wondering if anyone can offer me some tips on improving lighting for models at sunset. This is a typical example from my saturday shoot, where I took an average of the two, exposeure for the sunset, and the model, and its really just in between.
I am absolutely new to this lighting technique, so please start with the basics
(most interested in feedback related to how I can better light her, while improving the exposure of the horizon).
This was with SB600, and 28-70/2.8. I would rather more DOF, this was at 2.8, but much rather f11+.
Im not overly pleased with my results, but I am very keen to learn!
Kind Regards,
Oz

Wondering if anyone can offer me some tips on improving lighting for models at sunset. This is a typical example from my saturday shoot, where I took an average of the two, exposeure for the sunset, and the model, and its really just in between.
I am absolutely new to this lighting technique, so please start with the basics

This was with SB600, and 28-70/2.8. I would rather more DOF, this was at 2.8, but much rather f11+.
Im not overly pleased with my results, but I am very keen to learn!
Kind Regards,
Oz
