Commercial and non-commercial use
If you wish to use my RandomWalks cartoons non-commercially you have my blessing, though I would appreciate being notified of their use. I might then feel motivated to make more cartoons on topics that would be more suitable for your purposes.
If you wish to use my RandomWalks cartoons in a commercial venture I'd be delighted to help, however you must first negotiate a satisfactory payment to me for their use. I always retain copyright on my works. Note that if you pay me for my work it might prompt me to do more work more often and to produce work on topics that would be more useful to you.