It looks like a nice normal with some clear windows. Unless you specifically know that it's not (if you do, you should know what it IS), then I would absolutely call it a normal. Of course, it could be het for something--but hets generally look exactly like normals, which is why they are sold with paperwork to verify their genetics.
Various morphs have what are called 'markers'...specific parts of their pattern that can be used to identify them. For example, yellowbellies have a checkerboard of black and white lining the edges of their belly, they have a yellowish wash on the sides of their belly, and they have flames that come up strongly.
Mojaves are significantly different from normals in color--your snake has completely normal coloration.
Fires hatch out a high gold color, and lighten as they age. Your snake is brown.
I'm not as familiar with Mystics, but they have markers, too, and their coloring is off from normal.