The Astropad lets you turn your iPad into a drawing tablet for your Mac computer. You can draw directly into a program such as Photoshop or Illustrator. It only costs $29.99, a fraction of the cost of a Wacom tablet.
Here’s an interview with Sir Jony Ive in which he details how he and his design team developed the Apple Pencil.
A summary of the review is that the iPad Pro is a good tool for sketching, but not a computer for doing serious work. I have never used any digital device that could come close to giving me the control over my sketching I get with a simple, no-tech pencil. I make drawings and ink them, scan them, and finish them (sometimes) in Photoshop or Illustrator. I don’t need an iPad Pro for my art work.
Waterlogue is a digital painting app for the iPad. It lets you transform your photographs into beautiful watercolor paintings.
This is an easy little trick I just learned. Let’s say you are painting with the Brush tool and need to make a 45 degree line. It’s very easy. Click on the beginning of the line with the Brush tool and hold down the Shift key. While holding down the Shift key, click on the end point of your line. Voila- a perfect 45 degree brush stroke.