Very interesting... seems to basically learn that:

Faces -> some variety of flesh-colored from light to dark

Fabric/clothing -> blue

Sky -> blue

Vegetation -> green

Wood -> brown

Blank -> turquoise or tan

Small details -> fascinating variety of colors, but often a brilliant red

Which all seems fairly reasonable. For many things (like wood or skin) it seems accurate.

Obviously things like clothes come in such a variety of colors that there's simply no way at all to predict accurately, zero meaningful signal -- so if it settles on whatever the most common color is, it doesn't surprise me that would be blue.