There's a great app for capturing shapes or sketches previously drawn, Shape CC - once captured you then open the image in Adobe Illustrator Draw (iPad only) and away you go!!
I tweeted my first sketch produced with these apps and Adobe Drawing commented that is was 'very cool' - I was happy with that! (click link to see tweet and image)... https://twitter.com/ktdesignweb/status/600627270433316864
I'm also loving the Adobe Color CC app - point your camera and create a colour theme based on what you're seeing! It'll be a great tool to use on future projects!
I can see myself producing more digital illustrations this way and can't wait to spend time creatively playing! Here's my one and only selfie produced with Adobe Shape CC...