For the intermediate level with masking, it involved masking more than one image on the card front.
I masked the middle butterfly, then stamped the butterflies above and below. I colored the middle butterfly and left the other two white. My background was quite plain, so I used the flourish stamp in the set with ink that closely matched to give it a bit of background. I used a set designed by Gina K Designs for a Catherine Pooler’s Stamp of Approval collection. It is called Beautiful World. The background paper is Stampin’ Up Wisteria Wonder, stamped with GKD Wild Wisteria. The black ink is Versafine Onyx Black. The sentiment is from SU Paper Pumpkin, Sentimental Rose (April 2019).