I see that same white fluffy, comfy, shabby chic couch, or an L-shaped couch, or two loveseats facing each other...incorporate a super-soft inviting blue throw. All is echoing the beach and sea. If just a straight couch, I like two comfy wicker chairs with a medium blue (matching one of blues in rug you like most) cushions. Lots of light...if not natural, then make sure room is bright. Perhaps two lobster traps w/ glass on top as a table. A large piece of driftwood hangs on the wall in back of couch. If a fireplace, an abstract painting that feels like the sea and incorporates the blues, gold, and sand color. Hard wood floors? Also depending on light or dark, this will impact your choices. All your constants need to be taken into consideration.

I see light colored walls...perhaps Benjamin Moore Antique White, that is a creamy white w/ a hint of peach....making sure walls all blend, if not the same paint color from kitchen to dining to livingroom..Here is will be dependent on size of space. The more space, the more you'll want less wall color so flows from one room to next easily.

In dining room there are many choices for chandelier to carry this beach/sea theme through. 'Shades of light' has an awesome 'beach glass' light I love, if it fits your space, and general style. Otherwise, there are nice 'stars' as shapes, where you can hang two or three over table, or two smaller chandeliers. Again, will decide on amount of space. Next, LIght salvaged wood dining room table, with chairs covered in white canvas...sea grass or some sort of sisal weave rug..perhaps w/ blue border to bring blue to dining space.

Without knowledge of your constants, (room size, windows, fireplace, flooring, amount of light...)it's hard to advise, but hopefully some of those ideas will help you find your own concept to work from.
Enjoy!