My brackets are placed very low almost to the tip of the teeth? Is it properly positioned? (photo)

normally bracket position in the middle of the crown as per bio-mechanics. but in some conditions, orthodontists put it off-centered to overcome issues like underbite or overbite. in yr case bracket is very close to the incisal edge. By seeing yr pics, I feel you have a deep bite. in deep bite cases braces a little bit on the middle to incisal is common. but it's my advice to discuss yr concern with yr orthodontist.