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Ok Malick I've noticed alot of errors in the tile set. I'll number them off and say what each one is a little off in context to the surrounding objects.
-=errors spotted for the City Outside tileset=-
1. the bridge side the far right piece is a pixel to high
2. The statue of the woman or maiden(you pick) needs to be lowered down by a pixel
3. the large tree with the flowers on it needs to be a pixel down
4 the potted plant with the bridge parts needs to be dropped down were the bottom of the planter is flush with the bottom of the bridge parts(easy way to do that is make a line that can be easily taken out)
5 the banner needs to be raised up a pixel and moved to the right by one pixel so it'll be even 2 squares.
6. the two bushes the cone and round ones raise them up by a few then align them up with the last pixels of the table legs
7. this'll be the last graphical error check. The large group of trees has a big error to them for one if you put the two groups together they don't match up with each other.
Other than this I'll do a Graphical Error Report on the other tile set and point out what I see is graphically good or bad with.
I'm not saying there very bad, it's just I've an eye for graphical errors in a lot of tile sets. So I'll post what i see graphically about the other in the morning.