who is on the front of a bran new peso?

Answer 1

Assuming you are talking about the Mexican peso:

En el perímetro, el anillo del resplandor de la Piedra del Sol.
(On the perimeter, the ring of radiance of the Sun Stone).
Other than that, just the denomination, date, and mint mark.

See the following link for photos of all current and recent Mexico coins.

Answer 2

Jo goes to Mexico a couple time a year, could bring you a bag of those coins...