Hi there! If you can provide a link to the first photograph you attached of the bedroom you loved on the Houzz site, I can guide you to the profile of the professional who designed that interior and they'll be able to tell you the exact shade they used, or if not, the next best thing!

I have the same colour Windows and same red brick on my house and I used Dulux Balsa it works well with the black and the brick

Could you hang the mirror on the back of your door? You may need to get stronger hinges to cope with the weight. As for paint for the drawers, either the same colour as the wall or the colour of your existing furniture and decorate as the previous commenter suggested. God luck with it. By the way . . Very neat bed-making there .

I'd go for a warm light grey picking out the colour in the stone fire surround - have a look at Little Green Paint company's Portland Stone it comes in three depths of colour and looks beautifully restful. Then dress it with natural plants!