Round and round we go.
The pace seems not to slow.
It’s important that you know
Some cycles make you grow.
It is always a surprise to me when I do an image search with one of my own clipart creations only to find that it may be new. Pretty much every idea has been explored, and I will not be surprised to have somebody reach out to say, “Aw, I saw that years ago!”
Google search has a reverse image search option in the advanced options, and a site called Tineye.com also provides a way to check to see where work has appeared on the Internet.
In my own case, a search is for fun. The clipart I publish are released using the CC0 license. That license effectively removes all restrictions on reuse. If your work is proprietary, under full copyright, for example, services like Tineye can help you find out if somebody is attempting to use your work inappropriately.
For those who would wish to do their own clipart images, there is no better tool than Inkscape. It is Free Software (FOSS) with a great group of developers. Give it a try.