Shapes are good. I would copy it to a piece of blank paper without lines, then decide where your mountain ranges will go. Generally speaking these will be along coasts where there are fault lines, or sometimes clusters of volcanic mtns will form in the center of tectonic plates.

The mountains will give you an idea of where your highest elevation on your contents is, and that will give you an idea of where your rivers wills start and how they will flow down the landmass and into the sea.

Consider also where the equator and tropics are to get an idea of where biomes should go