Customizer face character's face using textures

how to make a face character customizer that could change in his eyes the face, mouth, nose. All of these parts are the individual pictures. I want to be able to change the color of the skin of the character, mouth, nose, eyes. But how to make a texture naklayvalas to another? Thank you. (I put a picture as an example, there is only 1 parameter - the eyes, but there will be more in the final version)