This is pretty good, but there are a few problems with this resource.
I'll address the elephant in the room: this doesn't fit as a Tileset Submission, but as a Loose Tiles Submission. It'd be best to either move this to the Loose Tiles section, or include a sample quest.
There is too much bloat in terms of the amount of tiles included; the wall tiles and the doors are redundant, for instance. You could easily get away with a much smaller amount of tiles, and still have a full set for use in projects. There's also a lack of variety in the tiles themselves; to me, having some suits as floor (and wall) decoration isn't enough to sell it as a Card-themed Dungeon Set, and same with the Slaughter-themed Dungeon Set. I'm not saying you should go overboard with a lot of varieties, but providing some alternates for the cards (A-10, Jack-King), some more torture equipment, game tables, and probably others I cannot think of at the moment could help spice up the tileset.
The last two are entirely optional, but the lack of a Door Frame (most notably the Entrance Frames) and a Dungeon Palette is a little irritating; especially since I'd like to use these as their own Dungeon theme. I know I can grab the palette from the image and assemble a palette that way, as well as make my own graphic for the Door Frames, but this isn't something people should have to do if they want to use this resource in their quests.
Please don't take this as an attack, but moreso as someone trying to help with some feedback; you have made some good stuff, and I wish you the best of luck with your future projects.