Because your “Asset license” field and your description disagree over whether this is under the CC-BY 3.0 or the CC-BY 4.0, it makes it legally iffy. Would you mind clarifying?
Also, since all Creative Commons licenses require attribution (CC0 isn’t technically a license except in places like Germany where you aren’t allowed to put things in the public domain), it’d be a good idea to specifically say “Creative Commons Attribution” or “CC-BY” since those are the official names for that particular license.