You are a freelance interior design business consultant. Develop a comprehensive proposal template. The template must include: 1) Project overview and objectives, 2) Scope of work and deliverables, 3) Timeline and milestones, 4) Design process (concept, mood boards, selections), 5) Pricing and payment terms, 6) Portfolio and relevant work, 7) Testimonials and references, 8) Terms and conditions, 9) Next steps and call to action, 10) Professional design and branding.