I need swappable character assets for a soccer game

Information for the business: Online football game
Industry: Internet/Software
Design details: I'm building a browser based soccer game and I need to generate random player faces by piecing together interchangeable assets (head shapes, hair, eyes, nose, mouth, moustache/beard). The player faces will include shoulders (like Panini stickers) and there's no animation required. The size of the player card will be roughly 120 pixels wide by 166 pixels high.

I will need a lot of these assets in order to create a wide variety of player faces. I haven't decided on a graphical style yet, but the game is slow and strategic so I'd like to move away from a cartoon style to something more serious looking.

Please include an example of the type of style of character that you could make and also the cost per asset. Thanks.
Ideas for the visual style: realistic / pixel art / 3d
Things to avoid: cartoon
Where the design will be used: web
Extra notes: