Talent pool: A modeling agency's popularity can be attributed to the quality and diversity of the models they represent. If the agency consistently represents talented and successful models who are in demand by clients, it can contribute to their popularity.

Industry connections: Well-established modeling agencies often have strong connections with reputable brands, fashion designers, photographers, and other industry professionals. These connections can lead to better opportunities for their models, which in turn boosts the agency's popularity.

Professionalism and reputation: A popular modeling agency is typically known for its professionalism, integrity, and ethical practices. Building a strong reputation over time through fair treatment of models, transparent contracts, and good working relationships with clients and industry stakeholders can contribute to their popularity.

Success stories: The agency's track record of successfully launching and managing the careers of models can also play a significant role in their popularity. If they have a history of discovering and nurturing successful models who go on to achieve recognition and success in the industry, it can enhance their reputation.

Marketing and branding: Effective marketing strategies and branding efforts can contribute to the popularity of a modeling agency. Building a strong online presence, showcasing the agency's work through professional portfolios and social media, and engaging with the target audience can help raise awareness and generate interest in the agency.

These are just some general factors that can contribute to the popularity of a modeling agency. To understand why Ranchi Modelling Agency specifically is popular, it would be necessary to research their specific achievements, reputation, and industry standing within the context of the modeling industry in Ranchi or the region.