male vs female
How many pencil widths tall is its body?
The scale speckles are common on cambodian interbred betta. Cambodians are generally the ones with one solid body color and a different color set on their fins but I've seen rare large-splotch cambodians where nearly goldfish/koi like areas of multiple colors appear, like calico cats.
The blackened splotches are usually nothing more than skin spots or occasionally healed nips from their time as a fry.
To determine male vs female, look for a little white protrusion behind the pectoral fins (the droopy ones by the gills) and check to see if there's an additional tissue behind the gill covers that connects all the way down to the rear of the lower jaw (where the sides curve forward towards the front on the bottom of the jaw). If there is a white dot it is female.
Don't despair if it is, girls try harder at being your friend.
Males almost always have the entire gill cover free to move and girls commonly only have "cheek flaps" that hinge/pop out.