Similar Vector files

Just changing a car's colour from red to blue will issue that refusal. If you have more complex modifications, it is allowed to send this in as a variant. If your prior assets were accepted, there is no reason to get nervous, as three similar assets are not considered as spam. You could, however, check the variants and if you think that the unpopular variants are not complex variations for a good seller image, you may consider deleting that variant.

'Similar' refers to content submitted by other contributors as well as your own.  Don't mess with approved assets.

Before you submit, compare your work with Stock inventory to ensure you're not sending them stuff they already have.

Your work should be unique in some way.  Color variation alone is not enough.

• https://helpx.adobe.com/stock/contributor/help/vector-requirements.html

Good luck.