I am looking for help adding some details to my game.

[BloodserGames]

By foreground I mean the layer above the level geometry on the airship. I think mostly the blue hue on the foreground clouds with the grey bg. The airship has my favourite BG. The tileset for all of these is really well put together, especially the 2nd one with all the Mario Forever Power-ups. The only problems I have with the 2nd and 3rd screenshot is that the BG is not to scale.

As for the final one, it comes down to how depth works with SMM backgrounds (judging from the airship BG, you understand how it works for clouds, but it's used in everything in the BG to give the impression that it's further away). I recommend putting an outline on the BG islands and maybe making the water look nicer (I'd reccomend you don't do the latter seeing as nobody has made a good custom ocean bg for SMB1 to my knowledge)

Hope this clears some stuff up for you, sorry if I sounded angry. It looks like it will be a pretty good game in all honesty.

haha Of course I clarify many things , I am going to improve all those things that you have told me and on the background of islands, I saw that you have a very cool beach background, I had already put it before, it has a good ocean. I can change the oceans of various backgrounds for yours.

https://bloodsergames.itch.io/super-mario-bros-lost-land
  click to play my Game!