These Coloring pages are perfect for teaching articulation!
Print it out and have it on hand.
Teach your client that our lips start closed together for the B sound, and then the air explodes out.
Get the minimal pair of this coloring page, too, and compare the easy to see mouths so kids can learn the difference between sounds, like /b/ and /v/.
As I hold up both the /b/ and /v/ pages, I say things like "See the teeth are gently biting the bottom lip for V like in the word Van, but for the B, our lips smoosh together, like for the word Ban." I make sure they understand the difference between the two, focusing on the teeth, lips, tongue and airflow.
Then, I hand out the coloring page and ask them to carefully color all the parts: lips, tongue, teeth and air.
You can have them repeat the sound as they color.
In a group session, I have the kids color in between turns.
Once the images are colored, I save them for further sessions so that I can point to specific parts on their drawing to remind them which part of their mouth needs to be adjusted.
Full page, easy to see and color.