Analogous colors are colors that are beside each other and share a common hue on the color wheel. When put together, they look more calming and pleasing rather than two contradicting colors (e.g. hot pink and neon green).
Have a lovely rest of your day/night, and good luck with your assignments! ♡
Las Meninas by Diego Valazquez is the painting that you are referring to. It is a rather famous painting and extremely popular for academics in the western world.
You should always do what makes you the happiest. If you choose something that makes you unhappy you’ll look back on your years and feel no sense of real fulfillment.