Hey Kellyzhangxi, First, thanks for posting your first dio here. Many are reluctant to do so, so my hat's off to you. Here are some pointers for you and please don't take any as a bad form of critiquing. It's just plain ole advise to help you on your way to being happy with it. Your cobble stones seem quite large, I would make them smaller, they were set by hand and I would hate to lift and set those all day. Your sidewalk is O.K. but if you look at the left side by the door there are wedges to fill where the spaces didn't met. An easyier way to do them is to pour a plaster section on your base and mark them out with a ruler and scribe them in. This way you can adjust the size so you wont have those wedges there. A bit smaller or larger will never be noticed by the veiwer. Your building edge has some seams in the middle which you can use putty or glue baby sand on to hide. I would also repaint the bricks that are grey to a duller red/brown/purple.orange. It depends on the area where the bricks were manufactured as to the true color. The dark brown/purple would be from being (baked longer than normal) but still used. Your layout seems fine so far. I will asume there is more to add? As this is your first dio, I'd say you are well on your way to a good one. Hope to see more as you go along with this. Remember rule # 1, have fun no matter what!