I love hollyhocks - they're my favourite flower!
I like the softness of this piece - it gives a gentle, romantic feel. My advice, however, would be to give a few harder outline edges to give emphasis. You could do this with negative space - drawing the background up to the edge of the plant to give emphasis.
I would also say, try not to place things right in the middle of the paper. It helps make a more interesting composition if you can think about the edges of your paper and how the subject relates to them.