You may recognise this card. I have based it on the gorgeous waterlily card on page 96 in the SU! Ideas Book and Catalogue.
I created the circles using the Circle Scissors. Now here's a tip for you: when you are wanting to cut out a part circle place about three or four small strips of temporary adhesive such as Dotto on the back of the part of the card you are cutting. If you still have the Dotto on the circle when it is cut, you had it in the right place! Does that make sense? If you have the Dotto further out the card moves too much.