Music Enhancement for Two Songs

I'm seeking an experienced music producer to enhance two of our songs. We have rough drafts that need refinement and additional instrumental layers.

Requirements:
- Improve sound quality:
- Equalization
- Mastering and polishing
- Add new instrumental layers:
- Enhance existing instruments or add new elements

Ideal skills and experience:
- Proficiency in music production software
- Strong background in sound engineering
- Experience with various instruments (especially strings, percussion, and synthesizers)
- Attention to detail and creativity in music arrangement

Please provide samples of previous work.