Which of the following sentences is grammatically correct?
1) María se seca la cara con una toalla.
2) María se seca su cara con una toalla.
3) María te seca su cara con una toalla.
Because secarse is a reflexive verb, there's no need to identify whos face is being washed, since we already know it's Maria's. And since you use seca, you would put se in front.