Learn How to Draw is described as 'collection of high-quality tutorials by professional comic book artist, Will Sliney. The lessons focus not just on the final drawing, but on the skills and shapes you need to build up your characters and figure work' and is an app in the Education & Reference category. There are three alternatives to Learn How to Draw for Android, Android Tablet, iPad and iPhone. The best alternative is Da Vinci Eye. It's not free, so if you're looking for a free alternative, you could try ShadowDraw.
Da Vinci Eye is an innovative tool for drawing and learning to draw. The app lets you overlay images onto paper so you can trace them. Great for practicing, following tutorials or getting proportions just right.
Artist's Eye is utility that helps you to draw or paint with real pen or pencil to paper or canvas. Choose model picture (e.g. photo) and while you draw watch your drawing or painting through the phone or tablet (that need to have camera).