You have a small bathroom and there is nothing you can do to remodel it because there is just not room enough to put in fancy equipment but, there are things you can do to make it look larger. One thing that has always been used to make rooms look larger and that is mirrors. You can install a large mirror over your sink. Or install two long narrow mirrors on each side of the large mirror over your sink.
When remodeling your small bathroom you have to take into consideration its function, how will it appear, what fixtures you will need, if fixtures are being changed, and storage space. You will also have to consider your budget for the job.
When considering paint and tile, or just paint for your small bathroom use light colors instead of dark or very vivid colors. If you are going to tile the bathroom think of using beige which is a neutral color and can be made to look brighter with bright towels hanging in the room.
To make the bathroom see larger than it is use a shower door instead of a shower curtain. If you must use the shower curtain then again, use a light colored one with only a few splashes of color. Use light colored wood cabinets and accessories instead of the deep toned woods.
If there is a window in the bathroom avoid a lot of ruffled curtains. Use a valance at the top of the window and a plant on the sill of the window. If the glass of the window is clear than use an opaque paste on window covering. The covering will still allow light to come in but will not allow anyone to look into the window. If you do not have a window but you have a blank wall on which something can be hung than design something that will give you the appearance of the outdoors. A picture of the outdoors is the easiest way to make the room look as if it faces the outdoors.
You can make that room look larger with a little bit creativity.