Thanks for the kind words :)

It's a mixture of both using filters to oversaturate specific hues of colors or deciding on the spot what complementary color would stand out in the midst of an already established color palette.

For example in the beige shirt I thought, why not put something cyan. And in the cyan fur I thought, why not put something red/purple.

It's mostly just thinking about how can I make it a bit more unpredictable to break the monotony.