Negative space in a plant

This is my attempt at drawing the negative spaces surrounding a pot plant.  Admittedly the pansy did not have that much foliage, which made the drawing a little easier.  It was quite hard to keep concentrating and draw the spaces surrounding the plant, rather than the plant itself.

This next exercise was called, plants and flowers in coloured pencil.  I have just realised that I did my drawing in pastels instead.  So much for reading the instructions! 

This last drawing was an experiment using a dip pen and coloured ink.  The pansies were obviously not this dark, but I got a bit carried away with the black ink.