Im a fan of restoration videos myself and one of the things that makes me watch videos of that kind till the end is the thumbnail.
Most restoration videos I have watched show the before and after results in the thumbnail and thats what makes me wanna watch the process of how they were able to restore the item to such extent, They get me curious to see how they've done it so I watch a good percentage of the total video duration
Your thumbnails dont capture my attention as much as the others that I have watched. You only show the before appearance of the cars you restore which doesnt appear to be appealing to me. If you showed the awesome result of your restoration it would pick my interest and watch the process of how you did it.
But this is just my own perspective and opinion, might not work for you.
