The rosewood fretboards are normally very dry when the arrive, though I mast say yours doesn't look a dry as many I've seen. It will probably soak up several applications of lemon oil to start with, and at the same time take on a darker appearance. After the initial application, it's worth applying some more lemon oil every six months or so. If you rub it on with a cloth, it will also help keep the fretboard clean.