Hey, see Fox, that is looking so much better. The only issues I see with that are basically mapping errors if anything. Seeing as you trusted my advice last time I'm going to give you a bit more and we'll see if you trust that!
The Shadows... The only way of actually making the shadows mesh with the world is to make cosmetic fog shadows like in my tutorial in my signature. Using a script or even character sets simply won't work and will spring up inconsistencies all over your maps. For example, the shadow of the lampposts are exactly the same length as the actual lampposts which just doesn't happen.
My suggestion would be to forget about anything like that until the end of the game, then I can suggest to you (or others can) what you can do from there if so desired.
If you want to try and make the world a bit more grimy, try this.
Use a Fog01, set it to SUB Blend and a low percentage of like 30%, Make the Zoom 100%. You can add to the % if it looks too weak but don't go to far above this as it looks overboard.
Seeing as most zombie games are set at night you could try changing screen tones too. Alot of people make the mistake of actually making the screen dark so no one can see what they are doing. We are playing a game thats SET at night, not IN the game set at night, we need to see whats going on.
I use:
Red -88
Green -88
Blue -40
Gray +153
You may want it a bit darker but remember if people can't see then there's no point playing... we need to make it look like night, not actually night. Of course you may not even want this location set at dark, but when you do, use this advice.
With regards to your mapping, think about things logically with the grass. The sidewalks are walked on a lot so often people would walk on the grass just next to it thus making dirt. People would also cross between to sidewalks taking shortcuts thus making dirt. The other areas i.e. further back will have been stepped on less therefore be more green and perhaps have longer grass. It's cool to have little bits of grass sticking out but there's actually a separate tile in the rtp for that. Don't use the autotile for that, it's too big and too uniform in shape.
Only other thing is I still can't help notice the road is too thin... You know you can cut and paste parts of your map right? Just cut the bottom half in the middle of the road, move it down and fill i nthe middle with tarmac, then just delete the odd bits and redraw the lines. It will look much better I think.
It's a good choice to use zombies because A) The size means it's easier to calculate when a bullet has hit it and B) it's easier to edit a geredeth sprite to look like a zombie so your graphics are consistent.
Good Job though mate, I think you know that it's coming along alot better now.