Yes, zed. (re your post of 01.06.20), Io Leonardo's painting of his 'm (us) e'/his 'higher self' (set above the world [re ML being seated above an aerial view of the landscape]) can be deemed "boring", but in a naughty sense! Like "Cavern with Ducks", "Mona Lisa" is a rebus in which Leonardo cryptically 'outed' himself as a man who enjoyed playing the Florentine "game from behind", as did many men of Florence [once a refuge for Cathars, who practiced non-procreative sexual acts, reputedly]. In other words ['suggested' by my (often naughty-minded) 'muse'], sodomy found more than one firm niche in Florence [!].
Take an appropriate image of 'ML' and place next to it (to the right) a horizontally-reversed perspective, and between the backs of the 2 MLs you should be able to see "What's in a cleft behind" [!] (as 'suggested' by J'): the shaft & head of a 'raised up' penis (such as Giacomo Caprotti's, that was oft in Leonardo's cleft behind/backside,) - 'the lay of the land', 'one' could 'say'. So, ML's famous smile can be deemed an "I've got a secret" smirk.
P.S. You might like to start a debate about whether Leonardo was a Cathar, given he was a vegetarian [like the Parfaits], well-versed in his knowledge of Scripture (re [e.g.] Revelations, 14:1 - 4, in which John claimed that the only people who'll be redeemed are those men who have not had sexual relations with women) & he only converted to the Church of Rome's version of Orthodox Christianity on his deathbed.