Bashir, to get an effective guidance on your question, it would be helpful to provide a floor plan showing plumbing, windows/doors, existing layout and to describe a bit about your vision. It can also be helpful to provide a plan that shows relationship to other rooms.
Pending that information, I suggest considering the size of the sink and shower, storage needs, how many users and whether you prefer built-in storage or storage units (as in moveable furniture/shelving).
A trick I have used is to build in a pull-out pantry that runs the depth of the shower--dramatically increasing storage in what would otherwise be unused space.
John James O'Brien | Inspired Living, by design
Dytecture
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