A paint is of quarter horse breeding. Quarter horses who have stockings that reached above the knee/hock, had white larger than (don't recall...a quarter?), and who had what was deemed too much white on their faces (behind the eyes or down the jaw) were disqualified and not allowed to show or breed. Hence, the paint horse association.
AQHA now allows more white in shows but the horses cannot be used for breeding.
All other horses that people often refer to as paints are pintos unless they have qh in their background.
So...the face you posted? Depends on if it's a qh and if the white goes too far to be accepted by AQHA.