The Mental Pocket Brush Pen is one of my favorite pens for drawing caricatures. The Pentel Pocket Brush is a great refillable brush pen that will allow you to experiment with line width. I get a lot of milage out of this pen before needing to replace its ink. The best results require a light touch to give you a variety of line qualities.​

I have found that after a while the ink will stop flowing easily and to get the pen working nicely again you will need to clean the brush under warm water and clear vinegar. I googled that information and found it does the trick.

These pens cost around $6 from Amazon and Michaels. 

Clip Studio Paint is an amazing program for both Mac and PC computers, I used it to create this cartoon illustration of a gold grouper fish for a t-shirt design. I have used many types of painting and illustration programs over the years and find Clip Studio Paint so easy to work in. Its tools and abilities are both similar to Photoshop while going farther as a great painting and cartooning platform.