Here's a print illustration for a specialist hospital called the Shepard Centre. The article discusses research that suggests that ultrasound can be used for treating seizures. 

My sketch (based on a sketch and concept by the AD Kip Williams at Soloflight) followed by the final.

A new personal illustration that I finished this weekend, where I had some fun playing with felt-tip pens and inks to create the flower part of the illustration, which I then adjusted in photoshop.