If you were selling it at 4K, you would only receive 2800 Robux, as Roblox takes a percentage. If you wanted to get the full 4K, you would have to sell it at 5715 Robux, which I think would be getting a bit over the top. Just keep that in mind.
I’m going to continue linking this post until devs learn that Studios typically just… don’t buy maps.
Don’t get me wrong, the stuff you have here is beautiful - I especially love the character of the pine trees - but selling an already made map just isn’t what people tend to buy, so asking for a price is kind of pointless.
Instead, I really urge you to create a portfolio with this piece in it
This is in my portfolio, and was mostly made for that
However I can also list it as a sale if I want to, and if somebody wants to pick it up they can. I understand that somebody would rather make a build specifically for their game, but I can still sell it just incase, I recently sold a map for 2k and listed another for 3k and ended up selling a part of that map for 1k. If I can create these for my portfolio and make some robux off of it directly, why not do that.