Texture mapping on face model

I have my own 2D face image and 3D OpenGL face model with triangle polygon mesh(I also have all the vertex coordinate).
How can I map my face texture on 3D model?
I wonder if I have to segment my face image to every pieces of triangle mesh and map each piece on every mesh in 3D model.
if I have to do that, in my opinion, this operation will take too much times.

Plz~~ tell me how to map 2D face texture on 3D model
thank you for your time…^^

If the image is just a front-image of your face, you can use the GL_OBJECT_PLANE as your texture generation function. Then the image is mapped just flat on your model, like looking at it from the front.