Realistic Fantasy Book Cover Art

I'm seeking a digital artist to create cover art for my fantasy book. The artwork will also be used as a website background.

Requirements include:
- A realistic art style
- Four figures as main elements
- Medieval city as the background

Ideal skills and experience:
- Strong portfolio in realistic fantasy art
- Experience in character and landscape design
- Ability to create cohesive and engaging compositions

Please provide samples of similar work.