Hate to say it, but i think you should start from scratch and study official maps more before making new version.
Before saying that he should restart it, you should give him reasons why. GOOD reasons why.
Restarting is the last option anyone should take (if that). Almost every map has something good in it. The author should be told why certain things are good, and certain things are bad, by the person who says they should start over.
Now, personally, I don't think you should start over, you just have a bit of work ahead.
Based off the screenshots:
Screenshot 1: It looks decent, but it is kind of a boring looking room. Get rid of the barn doors and maybe move the point onto a little platform into the corner. It breaks up the floor, and makes the point stand out from the room.
Screenshot 2: same thing as above, the cap is just in a small room. The reason I don't like this as much is because it looks cramped, and the ceiling is low. and the way you have tunnels, makes it hard to approach the point because you can't easily see what is on the cap (not even a little)
Screenshot 3: See above 2 comments. Also, that ceiling is pitch black. I believe you have a leak somewhere in your map you can locate it by using a pointfile, found in map > load pointfile.
Screenshot 4: Fog is REALLY thick, which is bad. Thick fog means that it is hard to tell who is on what team at a distance, and allows snipers and spys a huge advatnage. The height variation you have is good, but too tall. Make it less.