Stand in the doorway to your room and decide how you want your room to present. What do you want to notice first about the room? How are you going to use the room? How many people would you like to accommodate in the room? Where do you want your TV or where is there provision for it? Will it be easily visible from all seating? Will the positioning of your seating look inviting? When it comes to colour, do you want a room that looks fresh and cool or one that is warm and cosy? This will dictate your colour scheme as well as the natural lighting in the room. The room shown appears to take inspiration from the painting which is a very good way to start a colour scheme, but you can always work in reverse and find artwork that compliments and enhances the room. Once your have some direction, go shopping with your camera phone and take photos of anything that interests you. Collect sample colours where possible and gradually build your room. Don't buy anything until you have the major items decided - we can be very restricted in choices, and an impulse buy can end a disaster. It will all come together, it just takes time and patience.

you probably need a crowd of tradesmen to do all the work (carpenter, kitchen cabinet maker, plumber, electrican. painter, tiler, flooring installer etc) and you can have a builder take control and organise all the workers but the actual design can be done by you or an architect, building designer or kitchen cabinet makers might be able to help but, it depends on what needs doing...why not post some photos and a plan or a rough sketch of the existing rooms (including measurements, position of windows and doors and names of adjoining rooms) with a list of what you like and don't like and invite HOUZZERS to make specific suggestions so that when you need to contact the professionals you have a better idea of what you need

Some great comments and thoughts from you all. Trends are a consumer marketing tool to encourage you to continually spend and buy their products... A home should be a living curation of things you love that work for you and nobody else. Yes there are some design principles you can follow but these are a guide and should be considered along with the space, it's purpose, the light, the people and much more. Instead of buying more, consider what you have and carefully select things to complement them - update by changing things around and making sure YOU love the style and it suits the way YOU live!

You are right - leather is the go. You could combine a soft and mid grey, or bone and tan, depending on what palette you like. You are looking for the 2 sofas to relate to each other rather than matchy matchy? My preferred look too. You could use the same sofa in different shades, that's an easy get together. Or decide on one being more of a standout - like a mid century style wooden sofa with leather cushions, and then keep the other one simple. The top photo is that mid century style and the bottom shows a sofa that would coordinate with it. (similar wood legs and square edges). I know it's in fabric but it comes in leather. And it shows you what 2 of the same sofa in different colours would look like (both leather of course).