What is the ruling on money earned by a prospective groom from his work as a barber, and does the dowry become unlawful, knowing that he shaves in the "Qaza'" style? And what is the optimal solution to this problem?

Partial shaving (qaza') is reprehensible (makruh tanzihi), and it involves shaving part of the head and leaving part of it. The reason for its reprehensibility is that it disfigures one's appearance, or because it is the style of evil people or Jews. Trimming the sides without trimming the top is not considered qaza'. The earnings of someone who does this work are permissible, though it is advisable for him to seek a better job.