Its good that your enthusiastic and want to make many maps.
I would suggest that the Eboat map is not yet finished. As Roger said, theres no shadows, play around with the suncolor settings, ambient light, farplane and so on. If you go to the files page of the .Map site theres a file there called Worldspawn Reference Guide, you can copy the values from stock maps or adjust the numbers to your liking, I am sure with decent lighting the map will look much nicer.
As for construction, I think you need more on the quayside. Cranes, crates, barrels and other usual things you would certainly find there, adding detail to your map will make it look much more professional.
I dont think the deck texture of the boat is right, looks a little odd, I cant point you to a particular wood texture that might work but try highlighting the face and then under file at the top left of radiant theres a white box for inputting text, type WOOD in there, you will get all the textures with wood to browse through, find a better one than you have on there right now.
Keep it up, and dont rush through it, yeah its a pain in the a$$ when your eager to just get on with the next map but beauty is ALL in the details man
