The hexadecimal color code #0035a8 is a medium dark shade of blue. In the RGB color model #0035a8 is comprised of 0% red, 20.78% green and 65.88% blue. In the HSL color space #0035a8 has a hue of 221° (degrees), 100% saturation and 33% lightness. This color has an approximate wavelength of 468.52 nm.
It is a widely accepted notion among painters that it does not matter what one paints as long as it is well painted. This is the essence of academicism. There is no such thing as good painting about nothing.
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There is no must in art because art is free.
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To practice any art, no matter how well or badly, is a way to make your soul grow. So do it.