by Cap
I used to use tube and bottle paints, but just recently discovered the joy of acrylic inks, such as those made by FW Artist, a Daler and Rowney product.
They have a four star "*" opacity, are made for everything from brush to airbrush, and can be mixed with the other inks for lighter and darker flesh. The carry Sepia, Flesh, Antelope Brown, Brown, and many other interesting colors. Found them at my local art store, and the primaries, secondaries, and pearlescents at larger chains like Michaels and Jo-Ann Fabrics.
For sunburned flesh, you can lay a base of the flesh, and lightly drybrush with a lightened red or terracotta, until you reach the desired tone.
Others here may suggest the other brands, which I have heard that many of the miniature sculptors and painters swear by. I think this is faboo. It seems using the opaque inks prevent the cracking and such that happens sometimes. I found using my airbrush put the coat on far cleaner and far smoother than I could have hoped for, and with minimal cleanup.