I created two levels similar to yours. In the first, I corrected your cornering problems and made a few adjustments for visual appeal. These adjustments are as follows:
1. Fixed cornering problems.
2. Removed castle-inside carpet edging tiles in some places and replaced it with house-inside carpet edging tiles (see Adjustment #6).
3. Lengthened some walls to provide for smoother cornering.
4. Move bottom doorway up one tile to a place where it fits more nicely.
5. Moved stove down one tile to fit better against the wall.
6. Put house-inside carpet edging tiles around the entire level along the wall to avoid tile errors and smooth cornering.
7. Repositioned diamond-shaped castle-inside carpet tiles under the yellow rug to take into account new wall lengths.
8. Reposition lamps into the nearby corners.
9. Removed top-right goblet on the table to get rid of minor tile error.
10. Replaced door shadow tiles with the correct tile (see attachment for location of this tile on the pics1.png tileset).
11. Centered top doorways and bookshelf on top wall.
12. Replaced a few of the stove tiles to fit more nicely.
In the second, I made some more adjustments to try and make the level look nicer in my mind. These adjustments are as follows:
1. Added another section to the bar to make a "wall" as I believe you were talking about in your post.
1. Added bar stools.
2. Added more beers on the bar and spread them out.
3. Added different colored books to the bookshelf (including empty book space).
4. Added blackness to the outside of the level to draw focus to the inside and create illusion of room-exclusive sight.
5. Expanded stove to fit better and expand rest of the level (walling and bar) accordingly.
6. Added another table to fill up some of the empty space.
7. (not pictured) I suggest working on developing more detailed flooring designs.
Screenshots of both levels that I mentioned are attached. The first level I mentioned corresponds to the myfirstlevel-edit1.png file, and the second level I mentioned corresponds to the myfirstlevel-edit2.png file. I also attached an image depicting a section of the pics1.png tileset with a tile that I mentioned in the first block of adjustments highlighted for use with doorways.
To add a couch to your level, (1) begin by placing chair tiles and some sort of blocking tiles into an arrangement resembling the shape of a couch. (2) Then, click the "Baddies,Npcs,Chests" button on the right panel of the level editor. (3) Click the outline image and move your mouse to a position near the make-shift couch and click once to place the NPC outline. (4) A window titled "Edit npc action script" will come up. At the top text box of the window, type: "couch.png" (without the quotes). Then type the following code into the largest window:
NPC Code:
if (created){
dontblock;
drawunderplayer;
}
(5) Click the "Close" button in the bottom-right corner of the "Edit npc action script" window. Reposition the new couch image over the make-shift couch by clicking the image with the mouse and holding until you drag it into the desired position and let let go of the mouse button. All of these steps are outlined in attached images titled make-a-couch-#.png; follow them in order.
If you can not see the couch image, then you most likely do not have the image installed into your Graal directory. In which case you will need to play online until you see the image, or you may be able to manually download the image into the Graal/levels/images/downloads/ folder. I attached the couch.png image in case this works for you. You can also make couches facing other directions by using the couch2.png, couch3.png, and couch4.png images as well as other couch images that may be saved to your Graal directory.
I hope my words and screenshots give you some ideas to further develop your leveling skill.