Traditional Japanese Samurai Sketch

I need a skilled artist to create a couple of digital sketches of a samurai in a traditional Japanese style for commercial use. I'd be using these for the covers of my books and merchandise. I'm looking for a similar style to the pictures I've uploaded, and I'm willing to pay either by the hour or with a fixed sum depending on the artist.

Requirements:
- Traditional Japanese art style proficiency
- Experience in creating detailed digital sketches
- Ability to capture authentic samurai features and attire

Ideal Skills:
- Strong background in Japanese art forms
- Expertise in digital art tools and software
- Attention to detail and creativity

Please provide a portfolio showcasing relevant work.