No scale bar. Just a few particles with some bulk material. Agglomeration? Caking? None of the above? You need to prepare your specimen in a different way and take pictures with a scale bar.
Without knowing the size of the particles, it is not possible to categorize it. By default SEM output comes with a scale bar. But, scale bar is not visible in the above mentioned picture.
Likewise, for classifying it according to chemical composition, u need to perform SEM-EDX to find the chemical species associated with the particles.
Further to perform statistical analysis on the data, you need to satisfy the minimum sample size requirement of particular test.