Just to reiterate here: I'm no painting expert, which is probably quite evident when you look at some of my past pieces above. The beauty of creating with watercolors is that there isn't one set way of "doing it correctly." There are no lines you have to paint within (unless they're lines you drew yourself, that is), and you're free to depict whatever your imagination tells you to: objects, shapes, lines, people, patterns, blobs, and so on.
There are plenty of cool painting techniques you can use to add more depth, texture, and detail to your creations, some of which involve household items like salt and cling film. Feel free to check out this website to learn the essentials.
Image Source: POPSUGAR Photography / Victoria Messina