Yes; most of our clients purchase both Instagram comments and likes together. If you only purchase one, it could look unnatural, as it will not look like natural / organic engagement.
We can't entirely control what these Instagram comments will say, but we can encourage the users we send to your photo to leave a positive or constructive comment. They will generally be favorable / short responses, but they will be varied and natural looking. If you post a photo of a cool car, for instance, the comments will most likely be about how cool the car is, how people are jealous and wish they had it, and so on. You will receive a wide variety of different responses from real people.