Create a new layer.  Press Ctrl + L and load the Sunflower nozzle.  Set the Size: to 50%.  Paint in some flowers until you have something that looks like this (17).  Name this layer Sunflowers. 

Create a new layer.  Press Ctrl + L and load the Catails nozzle.  Set the Size: to 50%.  Paint in some catails until you have something that looks similar to this (18).  Name this layer Catails.

Create a new layer.  Press Ctrl + L and load the Red Lilly nozzle.  Set the Size: to 50%.  Paint in some flowers until you have something that looks like this (19).  Name this layer Red Lilly.