Churches can use illustrations in a variety of ways, including in newsletters and other printed (and digital) materials, on projected slides during worship, and in lessons and workshops (see suggestions in the individual workshops and also here).
The image pictured above is from Rotation.org's Annie Vallotton Bible Illustrations Collection. (This black & white illustration may be freely shared as long as the copyright notice is attached.)
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The disciples find a donkey and colt for Jesus to ride on Palm Sunday.
Jesus is welcomed at the gate on Palm Sunday.
People spread their coats and palm branches on the road as Jesus arrives.
Link to larger and higher resolution versions of the Vallotton illustrations as well as color background options that are in our Vallotton Bible Images Forum. (A Supporting Membership is required to view. Become one today). Copyright and usage information here.
It is a great source for Bible story images, no matter what art style or format you are looking for.
Here is a peek at the Palm Sunday illustrations from Lambsongs: (they are also available in black and white - great for coloring sheets)
You will also find illustrations there that may work better for older students, such as these from Sweet Publishing:
And there are great photos stills from the Lumo Project film, too! (https://www.lumoproject.com/)
Free online Palm Fronds with suggestions for use - from Illustrated Ministry. Great for church members at home during a virtual worship service to have something to wave. 
Also something the kids can take home to display on their front door or window.
Illustrated Ministry has a FREE Alleluia Poster that you can color and share -- on your door, window, mailbox, wherever it will be seen. Link to the zip file for downloading and instructions are here: https://www.illustratedministr...eluia-poster-easter/
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