Others can be another human, or paranimmita-vasavatti deva, for instance. Whoever or Whatever.
In our case, a human like Picasso, (unless he was a nimmanarati deva himself, :)) is providing humans (and devas of the kama loka), with his external khandhas and their related external ayatanani.
https://www.accesstoinsight.org/ptf/dhamma/sagga/loka.html
Picasso is providing us with his forms (painting), through the external field of sensory experience (ayatana) , that is somewhat what we call “sight”.
He is providing us with his feelings (his experience and his artistical research - vedana). He is providing us with his underlying artistical inquiries and his artistical assumptions (sanna); he is providing us with his personal artistical choices (sankhara); and he is providing us with his personal artistical personal knowledge (vinnana). All of the latter through the external ayatana that is dhamma.
And he transfers all these properties through contact; when this thing occurs in salayatana, at the level of our sense-consciousness proper.
Again refer to both definition of namarupa in this diagram.
It will make a lot more sense.
SA 298 and SN 12.2 is a rare parallel, where the two schools are not in a disagreement, but offer instead the big picture of the evolution of namarupa, when it is external, then internal.
In this context, only the khandhas in the external namarupa can be considered as “raw data” - but when they descend in salayatana, they become sensory data, through the fields of sensory experience that are the external ayatanani.
The form of Picasso canvas and painting, becomes his sensory form only when it reaches its external ayatana.
“Form” is not the really proper name of rupa (the external ayatana). It should be translated instead as “the field of sensory experience of the external khandha in the namarupa nidana, that is form”. That is to say the sensory expression of the “raw data” of the external khandha, in namarupa.
I hope this is not too hard to grasp.
However, the external ayatanani (feeling and dhamma) of Picasso, are his sensory rupa, vedana, sanna, etc.
“Not ours”.
Again what we “sense-conscious” is Picasso’s khandhas through their externel (sensory) ayatanani.
They are transfered through contact (phassa). Only then comes the appreciation & appropriation process.
Where does the inspiration of Picasso comes from is another question.
Metta.