Elegant Shopify Theme Customization

I need a custom Shopify theme tailored for selling physical goods. The design should be classic and elegant.

Key Requirements:
- Customization of existing Shopify themes or creation of a new theme
- User-friendly navigation and mobile responsiveness
- Integration of payment gateways and necessary apps
- SEO-friendly structure

Ideal Skills:
- Proven experience in Shopify theme development
- Strong design skills with a portfolio of classic and elegant designs
- Knowledge of SEO best practices
- Familiarity with payment gateway integration

the theme description is in the attachment