Add a splash of colour
Go to Filter>Filter Gallery then to Artistic>Cutout. Set the Number of Levels to 8, Edge Simplicity to 0, Edge Fidelity to 3 and hit OK. Now go back to your Layers panel and click the sketch Layer at the top of the Layers stack to make it active and click the eye icon to make it visible again. Change the Layer blending mode from Normal to Overlay and drop the Layer Opacity until it looks good. Finally, click on the Horizontal Type Tool in the Toolbox, run it over the area you want the text to appear and type in the species name, then tweak the Colour, Font and Text Size to your liking.