Flowers in coloured pencil

This vase of flowers was past its best and some of the flowers were wilting and some of the leaves going brown. Since some of the flowers were white, I draped a blue curtain behind.

I used watercolour pencils (mainly because I have a good range or colours) but I didn't put any water on them.

I struggled to get real definition in the white flowers, using a grey pencil to do the shading. I thought about trying a different colour, such as blue or yellow, instead but my nerve failed me.

The picture took me quite a few hours and I'm not sure the results really reflect the effort that's gone into it.