How to build nice ships ?

Hello There

For many Days, I was trying to figure out,how to build something good loking... but I always end up with trash...

I don't know why, maybe I just need fantasy,but I have plenty of that..

So I wanted to ask you for your tips:
How to build something good loking ?

PS: I have watched Raiben's school design,but still quite don't know how to do it.