In majaz, a word moves beyond its assigned sense; an 'alaqa motivates the transfer and a qarina prevents taking the original sense. Isti'ara is the type of transfer whose relation is resemblance.
Explicit/implicit: which comparison term is expressed or suppressed?
Primary/derivative: is the transferred expression an underived noun, or a verb, derivative, or particle?
Reinforced/stripped/unqualified: are any further details suited to the source, to the intended target, or to neither?
These foundations prepare the next level on majaz mursal, in which the relations are not based on resemblance.