Realistic 2D Character Portrait Illustration

I'm in need of a talented illustrator to create a close-up, realistic 2D portrait of a character for me.

Key Details:
- The character should convey a serious expression.
- The color palette should predominantly consist of cool tones.

Ideal Skills:
- Proficiency in realistic 2D illustration.
- Experience creating character portraits.
- Strong understanding of evoking emotions through visual art.

Please include samples of similar work in your proposal.