In my experience, I've found it easy to make figures with Wolfram Mathematica (the python analogue would be matplotlib) and with Tikz (http://www.texample.net/t

In my experience, I've found it easy to make figures with Wolfram Mathematica (the python analogue would be matplotlib) and with Tikz (http://www.texample.net/tikz/examples/all/ http://www.texample.net/tikz/examples/all/) If you want to check out what might be possible within the Mathematica system, you could try out https://www.wolframalpha.com/ https://www.wolframalpha.com/ Further, hand-drawing on a tablet using a stylus is highly underrated.