Hi Liz, it is a good pic

Dave and Frank told you many suggestions, and you have a lot of home work and "in field " work for your next walkabout on the beach ...

I would like to add another suggestion.
Try to work hard also in order to improve your skills when shooting.
there are many matters.. just to mention some of those,
composition: the horizon in the middle of the frame is usually avoided in landscapes (see "the rule of thirds")
http://photoinf.com/
exposure: learn to use all the metering modes the camera allows you, a lot of the results of Dave's post processing can be reached with a more correct exposition (and composition)
subject: try to identify clearly the subject and try to find the way to emphasize it (the subject is the sky? --> low down the horizon, is the reflection? less sand and vertical crop)
...
I know... photography is a really big "world" ... but that's the reason it is so interesting! isn't it?
we all are here to walk on it round and around !

keep on shooting! you are on a right way!


hope this helps...
Nicola