Hi, You don't say whether construction is completed and you've moved in yet or if you're going from this plan only. If so it's a good idea to live in a space for a while before knowing if your changes are really necessary. And you can change around your dining/drawing areas easily until you feel right about it. I'm not so sure if it would be a good idea to chop up the space like that, and the two furniture arrangements serve amply to define the spaces. If you are finding a real privacy inconvenience then here is a nicer solution i think. A semi transparent double sliding door like this across the study area opening would give enough privacy while at the same time allowing light to show through and not totally closing off the space :

You definitely don't want to emphasize the T-wall, as it will just draw the eye to the mismatch in scale of door and window. I honestly am not sure that an accent wall does anything other than provide an excuse to make fewer art decisions, but I guess it could be ok on the larger wall...

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it depends on what kinda design you like - contemporary designs, traditional designs etc. Once you know that designing what you want becomes easy. Walls - you can have all white walls and one different colour wall. Sofa - This is the center of your living room and other designs and colour revolve around it. Pick sleek, sold colour sofas. A center table that goes along with the sofa and a big carpet under it. Curtain - curtain colours should match the sofa. Pick one spot for the study table, its placement doesn't look good.