By default, LaTeX produces professional-looking documents. Specifying an extra couple of packages, however, can make your document look even better. Here are four packages I recommend that require no effort, by which I mean you simply add the package to your preamble (and maybe specify a few options) and you’re good to go.
When designing any figure with colour, consider the Hue-Saturation-Lightness (HSL) colour space. It is the most intuitive and simplest colour space to work with. For examples of why it is well suited to scientific figures, skip to the bottom. To learn the details, read on.