Hi. As people have mentioned on some of your other assets, your licence here of "public domain" is incompatible with you then saying that a person can't sell the asset. Public domain means you are giving up all rights to the work and anyone can do anything with it, including using it for anything, altering it in any way imaginable, and selling it as is or altered.
Rather remove the licence and instead write something to the effect of:
"Terms: No credit is required. Commercial, public, and private use is allowed. You may alter this asset to use in your (commercial or non-commercial) projects but you may not sell the original version or any altered versions as standalone images or assets."
You can also look at an example LimeZu uses, which is more elegant than what I just typed.
(Love the art by the way.)