In the Split View of iOS 11 you can drag sketches, doodles and even GIFs from an ordinary file right into your iMails and iMessages, or vice versa.
And yes: Instead of a file, you can open this website and drag my sketches into your mails and messages. Try it with the following sample (free for personal use).
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Out of the iBook Example 3: Pictograms and Emojis than Stickers
Pictograms to use
see next page