Why do different paintings of Krishna depict him differently? Why dont we have even one photo of Krishna that depicts him accurately?

From Akshay Lila Prabhu:

I was taking the session “Srila Prabhupada speaks out – On seeing God” at NITK, there Srila Prabhupada says – When Krishna was present on this earth, so many people saw Him.

SO one boy asked me Q – Now by modern technology, I can take photo of “XYZ” & show this is how he looks like. Vedic technology was far more advanced, why can’t my facilitator show me ONE photo of Krsna & tell – this is how Krsna looks like. I’ve seen so many photos & in all of them K looks different (face cut etc), why its so ? So pr ji how to Answer this Question ?