3D Book Mockup & Social Media Poster

I'm looking for a realistic 3D mockup of my book to use for marketing on social media. Additionally, I need a modern and sleek social media poster to promote my book to the general public.

Requirements:
- Realistic 3D book mockup
- Social media poster
- Modern and sleek design
- Targeting the general public

Ideal skills and experience:
- Proficiency in 3D modeling
- Graphic design expertise
- Experience with social media marketing materials

Please provide samples of previous work. Thank you!