The painting is made by Viktoria Sikk, my mother. She is my first piano teacher and also a painter.
I think the piece is often played too fast. The tempo or character marking by Mr. Prokofiev is -andante tranquillo-. It means in Italian – calmly walking or calmly going.
And in my opinion the character markings can not be compared with metronome exactly. Often metronomes show, that if it is andante it should be this or that fast on the metronome. I think it is a strange approach.
When played in a slower tempo, the piece can have a lot of nuances and colors that could get lost otherwise when played in a faster tempo.