Graphic Designer (Graphic Animator)

Only taking applications from people who submit either prior thumbnail work or preferably imitations of thumbnails listed below!!!

Looking for a graphic designer/artist to make thumbnails for a science YouTube video. I would provide the description of the video, and usually, a rough sketch of the desired thumbnail (or you could come up with your own design if you have a better idea) that you would then make in either Adobe Photoshop or Illustrator (or another program) and send back to me. You would be paid a set amount per thumbnail. This would be a recurring job with somewhere between 2-6 thumbnails a month. Looking for someone who can design thumbnails in a somewhat similar style to the following. In my original posting, I received many applications for graphic designers whose style did not match what I am looking for (although I know previous applicants weren't able to see the links), but as a result, I will only consider applicants whose portfolios already show similar/high-quality thumbnail works, or include a few mimicks they make of some of the linked thumbnails.
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Would like to see examples of work in your application, ideally as similar to the requested styles as possible.