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I tried to give it the medieval feel, and I think I succeeded. (And even though you didn't ask for a princess on the cover, I included her with the knight and the dragon, which I think made the cover better in a way.)
Hand drawn (with added texture):
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For this one I decided to do the dragon alone.
(the drawing was drawn by me, but the texture that was added on was from https://www.pexels.com/ (or some other free image site)
The images used in the photo edited cover were from, https://pixabay.com/ and https://www.pexels.com/
This is there for those who would like to make a cover like this.)