Originally posted by sonhouse
These are not drawings but photos made by dozens of telescopes on Earth and in orbit.
It incorporates photos, but overall still takes a lot of artistic licence. I am sure the outer edge (a quarter of the diameter) is not based directly on photos. The rest of it is just photos put in the approximately right places but not necessarily correctly to scale.
Certainly the scale of the sun in proportion to the planets is wrong as are the sizes of the planets in relation to each other.
It does look nice though.