Retro National Park T-Shirt Line

I'm looking to create a line of casual wear t-shirts inspired by the beauty of national parks, specifically focusing on mountains and forests. The designs should capture the essence of these natural wonders with a vintage and retro aesthetic.

Key Requirements:
- Design themes based on national park landscapes, particularly mountains and forests
- Vintage and retro design style
- The t-shirts will be used as casual wear

Ideal Skills and Experience:
- Strong graphic design skills with a portfolio showcasing vintage and retro styles
- Experience in creating nature-inspired designs
- Ability to translate thematic concepts into visually appealing artwork