High-Quality Website Graphics

I need lightweight, high-quality graphic images for my courier and logistics website and social media.

Requirements:
- Images for brand promotion and service representation.
- Must include company logo, contact details, and service icons.
- Optimize for fast website loading without compromising quality.

Ideal Skills:
- Expertise in graphic design.
- Experience with website speed optimization.
- Strong portfolio in logistics or corporate design.

Please provide samples of previous work and ensure designs are mobile-responsive.