Drawing on a coloured ground

I have been very busy with  a local campaign, therefore time for drawing has been limited.

 I did not complete an exercise from last week's class, on identifying tone in a painted portrait and felt a bit despondent about that.  Thank goodness I was more successful with these week's efforts, drawing a vase of flowers using charcoal and chalk in to a coloured ground.

I quite like this as it looks rather Victorian and gothic, which I think is due to the purple ground.