To create my layout, I selected a gorgeous galaxy-like paper from the Smitten With the Stars Bundle by et designs. I extracted the telescope from the photo, and placed it in the lower right. For the Moon, because it's glowing on a completely black background, I only had to change the blend mode to Screen (or Lighten) to isolate it from the background. I played with it's position until I liked it. The idea was to make it look like the telescope is pointed at the Moon, which is in front of Sagittarius.
Next, I added my three flowers as a cluster near the telescope's tripod. There's a bit of olive green fluff above the flower closest to the telescope which is actually a tree from the photo, masquerading here as a leaf. I added my title and then I added a text block for all of the journaling, including the date. Finally, I added the constellation of Sagittarius to finish the piece. When Artemis II is behind the Moon, if you were looking up from Earth, the Moon will be in Sagittarius.