It's not too bad but it can be greatly improved!
When I started mapping well lets just say my first map was blocky
I wondered how people made cool maps with arches and stuff so I started reading tutorials @
http://www.twhl.co.za and learnt a lot.
Also testing these things out e.g. I didn't know how to make water when I first started so I made a test map and it took me a few hours to get it perfect.
Same goes for you!
You must keep practicing.
Use the clip tool and arch tool. You will find them on your own like a lot of us. If you really enjoy mapping and want to continue and you have that feeling inside that wants you to make your own little world where peple play on it then carry on practicing and don't release your first map unless it's as good as the top maps you see online. Trust us as we have all made mistakes and one of them was submitting our first crappy map.
Now that I look back at it I laugh and thought what a load of crap I was
So listen to us and start again or carry on if you think it will help you.