what cars did you reskin, I think I recognize CloakedGhost's ATSF RPO car, are those the Auran defaults? You might want to consider using a different truck, as those are floating. Other than that, nice reskin.
I think you'd better seek permission if you plan on releasing them. Since they are payware, you won't be permitted to do so.
I guess if you are only showing screenies of them, then that is possibly ok. I've seen occasions where creators even prohibit screenshots of modified content that they own.
I always seek permission from the creator to see if I can release before I even post screenies.