So what is the license?
CC BY 3.0
CC-BY3 is compatible with the 4 version. Consider to use 4 version. If you will do it, you should add the license into metadata for the asset packs:
"Edit asset pack->Metadata->Release Info->License for assets" It will increase the size of audience that will be able to find your art
Thanks for the tip, I'll change that :)
