If the R side of your skills is pretty good, then you'll definitely want to start reading Edward Tufte's books, particularly The Visual Display of Quantitative Information and Beautiful Evidence, both of which provide excellent insights into how to present data effectively and efficiently.
You should be somewhat forewarned that everyone has a different idea of "beautiful," however. Tufte is a big believer in maximizing a quantity he calls the "data-ink ratio": how much of the page's ink is dedicated to data instead of what he calls "chartjunk". This causes his work to have a sleek, minimalist oeuvre that certainly makes it easier to digest everything but that some people may find too utilitarian. But for Tufte, function and form are pretty close to one thing: the more it helps you, the more beautiful and elegant it is.
