His caption gives him the title Yajaw K'ak' or Lord of Fire. The king is not looking his way, so his adoption of our Gesture 2 is difficult to interpret as a greeting or acknowledgment of submission. I believe, instead, that it was meant to communicates his social standing or rank to viewers of the monument. Given all the previous clues (frontal pose, relative placement and lordly title), such a standing must have been quite high.