I find it difficult to view your floor plan as it blurs if I enlarge it, so excuse me if this comment is invalid. Assuming the entry is from your living room and the home runs lengthways with the hall linking the bathroom, ldry and bedroom from the kitchen. The issue with this is that having two doors in the kitchen means you cannot form a working triangle for it to function well and don't have enough wall to fit out with tall storage. However, if you sealed up the door to the hall and opened access to the hall from the lounge as your plans seems to indicate in the top right of the lounge area, then you could widen the front opening into the kitchen rather than remove an entire wall, so integrate it into your living zone without lumping a kitchen in the middle of your lounge, you will improve your walk through flow, and gain a new length of wall in the kitchen where your fridge could go into the corner with a larger pantry flanking it, then your proposed layout t follow.

We just decorated an almost identical room. We started with a couple of matching, new, couches in charcoal gray, then, when we could see the size of remaining area, added a rug, a couple of armchIrs, coffee table, side tables, all of which we got from an old wares/antique shop, to add interest, and to avoid an overall matchy look. I then added lots of cushions in greys, white and oranges, which bought in some colour, which was needed, and colourful throws. Finally we added some colourful artworks to the walls. Room now looks cosy and the dark couches are practical and easy care.

I agree with jmm1837 about the lounge, but I think it might be the hide throw cushions that makes visualisation harder - maybe think about saving those for a different look. Perhaps have the room an ecclectic mix rather than one specific style. Think about light sandy beige (not cream) walls, lighter timber floors, the odd piece of furniture in a lighter timber or that's been limed or even glass topped to keep the room feeling open. Using furniture that has been lime washed and distressed can also work. Because your cowhide sofa's are statement pieces, think about bringing in the beach feel with colour rather than specific objects. You could try using really large abstract art pieces (eg. if it's over a buffet then it have it the width of the buffet, if it's a bare wall then try to use up all the space either using a singe canvas or a triptych) that use beach colours you want to incorporate . Echo the colours of that artwork and even a bit brighter or paler but in the same colour family in your accessories and soft furnishings. You could also incorporate lamps that are glass/beaten silver/rope bases and light coloured lampshades. You might also want to think about a really large fluffy area rug in a light neutral/sandy colour under a glass low coffee table for the middle of your sofa area. On that table you could then feature beachy accessories such as a bowl of shells, a piece of driftwood or low piece of art such as metal fish or a ceramic starfish etc. just keep it simple so it doesn't look kitsch Burlap is great but it can be hard on your hands and sewing machine if your making curtains yourself and doesn't block out light unless your using backing - unbleached calico that is rubber backed is an alternative for privacy if you decide that dealing with miles of prickly burlap is not what you want to do - keep the burlap/calico to give you more privacy as pull across curtains using them to dress the walls on the sides of your windows (makes them look bigger) using a second curtain rod, and use your sheer curtains to give you a beaufiful breezy feel on a more discrete rod (you can even use a curtain wire kit if you're not going to draw the sheers aside). To keep your casual beachy feel think about using large curtain rings on a rod for easy sliding or big eyelets on a chunky rod with distinctive finials Good luck with your project!

Other colours that work with red are turquoise, apricot, peach, any blues, yellow, even some pinks and greens. (Look to gardens for inspiration, or Old Masters paintings). I'd find patterns with combinations of those, or Vys colours, in a rug, and chairs or cushions.