Hey, I don't recommend putting your assets's preview plain like this- people might just copy paste those and not pay you!
Your art is very nice that would be a shame
Viewing post in Top Down Tileset Sandy Desert comments
I don't think it's a big deal really.
1. It's not the actual sprite sheet, it would take more effort in time to steal than earn the money to buy them. People that steal assets are the type of people that make things no one sees or cares about, and are going to find a way to steal it one way or another.
2. You have a record of who's bought it and who hasn't. If someone made any real money off of it, you could get retribution.
3. Seeing as much of what's offered as possible helps buyers. While seeing it in action (AKA a well done preview without the separate components) can both prevent people from nabbing them and show what's possible, seeing all of what's offered is a valid way to show what's available without spending all that time making that preview.
In the end it's up to you what you do. I've purchased your Roboto series and a few others, and think you make great assets, so I know your assets are good, but please do include good and accurate previews of some sort for others. It always sucks buying a pack that the maker put more time into making the preview look good, than making the pack itself, and the pack turns out to be incomplete, or you need to buy all their other assets to do what you see, etc.
Anyway, sorry for the long comment on an old comment. Keep up the good work!!!