While it gathers cybernetic dust awaiting a future article, it may as well be displayed here anyway.
My standard but always cunning plan is to post my original images in a blog under my control, simply to ensure that copyright is obvious for my work.
Publicity for my Binomial Coefficients Article
One Binomial Coefficient Writing Tip
Generally the publisher or editor of an online magazine has a definite opinion of how large an article should be.
My goal is to give "value" to my readers. Although they don't "purchase" my articles, they do invest the time to read...or at least, to click and then scan quickly.
My Binomial Coefficients article had enough details and length that there was no need to include Pascal's Triangle. That, despite its close relationship to binomial coefficients.
Some sites would prefer a very narrow topic for each brief article. "How to Plug in a Toaster" might be as broad as that site allows.
Others allow each article to cover a gamut of sub-topics. "Fishing for Catfish" might include choosing a rod and reel, bait, type of water, noodling (catching the fish by hand!) and appropriate use of a net.
My current Binomial Coefficients article is just under one thousand words. That's usually enough for two or three pages in Decoded Science, and sufficient to introduce the topic.
So today's writing tip is to know the length of articles most desired by your readers and your editor.