Back (apologies for my handwriting!)
The text of the postcard is
Don’t you think it’s amazing how misunderstood some artists can be? For example, this is one “art critic’s”* review of this wonderful painting: Eye floaters are small moving spots that appear in your field of vision. They may be especially noticeable when you look at something bright, such as white paper (or an empty canvas).
Critics, huh? What goons.
*Maybe this was not something from a critique but instead from WebMD.