It doesn't take much to carve out a space for yourself for a functional office. Remember to include all the little things you need but just as importantly, all the little things that you love! The pictures and paintings here are very personal and look like they inspire the owner of this space.
Just a word of caution though - this space is obviously staged - NO WIRES! If you can hide your wires, because there always are wires!, it is always best for the most serene look. For practical reasons, a cell phone might replace the nostalgic telephone (and then it would in fact be no wires!), and you can charge your laptop in a charging station elsewhere in the house, so this can in fact be real... but then there's that light fixture! ;)
Just stay real - some wires are ok - it's just reality... for now anyway.