Is there an option to have a minor nose job to make the nose tip more angular if it's round? (Photos)

There is no such thing as a minor nose job, since rhinoplasty is the most difficult procedure to perform in the entire field of cosmetic surgery. The tip of the nose can be made more refined, but it's very important to have a full set of facial/ nasal photographs, since the nose is a three-dimensional structure. For many before and after rhinoplasty examples, please see the link and the video below

Certainly modifications can be made to get the refined narrower tip you are looking for.  This would usually involve  partial resection of the tip cartilages and possibly suturing the tip cartilages .  Make sure you see a highly qualified experienced surgeon specializing in rhinoplasty and review goals with computer imaging preoperatively.