A bit of history
As you know, the first patterns on head began to be used by peoples of Polynesia, in particular, the Maori tribe. With the help of such tiny or huge images, they displayed the history of their life, frightened enemies and ill-wishers. Time has passed, but small tattoos have become even more popular, so the face can also be used as a little canvas. However, there are several tiny but important nuances that you must understand before creating a sketch on your head at all.
Over the centuries, tattoos located on head had only two functional meanings: aesthetic - with their help, tribal leaders or honorable people demonstrated their status and position in society, it might also symbolize occupation, military successes; violent - tattoos were applied by force to faces of prisoners or slaves, and also used as a stigma, punishing criminals with them. This all is super-interesting information, but it's in the past. In our civilized world, a person who has an idea to make a sketch on his/her face simply causes conflicting emotions among others. Especially, it touches females, cos their faces are considered to be clean and clear.
Tattoo ideas for male and female faces
Among girls, facial tattoos are usually tiny and cute. For example, in the form of a smiley or a flower over an eyebrow. Anyway, it means, girls prefer to make a little picture which is easy to hide with hair sometimes. Men often prefer a more brutal style. This is especially true for rappers who fill the letters of their stage name on own face in a corresponding font. However, the variety of options does not end there. This means that men and women are not limited in their choice. This is just a matter of aesthetics and your inner world.