Here's this week's sketch! For proportions, the main thing is to keep your whole panel layer proportionate to the card base. So 3.75x5 or 3.25x4.5, that sort of thing.
I went with a cheer up sort of card!
Stamps: Super Stars
Paper: White, Smokey Shadow, Lemon Tart
Ink: Smokey Shadow, Summer Sunrise
Accessories, etc.: Gray Taffeta Ribbon, Big Scallop Edge die, Small circle hole punch
If you play along, feel free to leave a link: