Help for a rookie...

I was wondering if you could teach a newbie some tricks on landscapes with NEX-5n. Some people can get breathtaking landscapes... Mine, well...

The best landscape sunset shot I was ever able to do is the following.

It was shot in Raw, f 6.8, 1/160, iso 100.

The best edit I could do is this:

My questions:

• Should I have raised shutter speed?

• Is it preferable to merge multiple shots at different exposures in order to get the best result?

References for nice looking lanscapes: forums.dpreview.com/forums/readflat.asp?forum=1042&thread=42297581

Thanks for your tips!