a few of those shots made me sea sick. level horizons are a must for starters. there are quite a few marketing threads, too much to retype here. though it sounds rude to say it, it does come up every day. as others said you need a lot more work, eye catching things. you need larger cleaner images, free of noise. you need descriptions and keywords. like that marina - landscape - was the only word, and there is no land. every one of your keywords is landscape. don't put the orientation. add everything that is in the shot.
so your homework
1. add more work
2. clean up the work you have - straighten things etc
3. add larger punchier work
4. add descriptions and keywords.
from there, then tell people you have a store, a dozen images won't go far.
---Mike Savad