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Looks great! Love that you're thinking ahead and planning for her high school years.. i'm sure she'll have a collection of school books to organise in her room. The daybed thing is fantastic, with the afternoon sun rolling in and a nice cup of tea... sounds perfect!

Before replacing your curtains as this can be quite expensive for such a large window, if they are in good condition, add a band of extra fabric to the bottom in what ever suits you, your existing curtain track can then be moved up to the ceiling for good looking full length curtains without the large round eyelets, could save you a lot of money, I would look at replacing/removing the sheers cheers

if it's a rental i would invest in some tall modular bookshelves eg Ikea billy with combination of open shelves, solid or glass doors and shelves, space for printer and fax on top of matching filing cabinet and a chest of drawers for office supplies and set down counter spaces, wall shelves above the desks for books and reference materials, keep your original mismatched desks and buy some quality desk lamps and extension cords with circuit breakers and cable organisers to make sure you have the necessary power where it's needed.... if it's your own home i'd have the same furniture and invest in some extra power points, a dedicated phone line for fax and internet, and make sure you keep all receipts for your business tax and depreciation expenses...my suggested floor plan has the desks on opposite walls, bookshelves across the end wall and above the desks, twin filing cabinets, wall shelves, space for the aircon and a spare chair for visitors but the precise amount of storage depends on the products and services you supply and what equipment you need