I have painted the underside a very dark grey (pics a bit later )as I thought black would be too stark, I painted my Lysander plain black and I don't like it at all.
I plan to overpaint the markings with black for a bit of contrast as in the picture below.
I may also leave the upper surface markings alone ( White cross outlines ) again for a more interesting look.
I'm guessing it looks the part, and the second pic shows better contrast - but the pics make it look slightly 'bleached' and bluish grey, but I'm sure that's the lighting (or flash?).