Here I have started to block-in my foreground.
I prefer painting water to painting grasses. However, there are some pieces which require grass. To avoid painting every blade (a task not only boring but unnecessary) I find if I rough-in "grass-y" colors then return to them later, I can create the feeling of grass. By the time I finish painting the giraffe, the lower half of the painting will be dry and I can dry brush a variety of grass textures and colors.