Monochrome Flowers

I'be wanted to enter The Flower Challenge for ages, but this is the first time I've actually accomplished that. I found this latest challenge really - well, challenging!

I find it hard to stay within one colour family. Here's the card I came up with:

Ingredients: Stampin' Up ink (Basic Black, Blushing Bride, Sweet Sugarplum), card (Whisper White, Blushing Bride, Merry Merlot), Thinlits (Botanical Tags), Stamp (Happy Birthday Gorgeous - sentiment) and tag punch.
Other: Derwent Intense Watercolour Pencils.