GLB Texture & Lighting Correction

I have seven GLB models that need a quick but careful clean-up pass. The files will be used on an online tool using three.js.

What I need from you:
• Make textures and colors more uniform and correct
• Adjust the lighting inside each file so that it's uniform across all files
• Add a logo on 1 or 2 faces of some of the models
• Export small file sizes

Deliverables
1. Seven updated .glb files with all textures packed.
2. One set of quick viewport screenshots (front, back, and an angled hero shot) demonstrating the corrected look for each model.

Acceptance criteria
– Files open error-free in Blender and display correctly on the tool on my website that uses three.js
– No black or missing materials; no obvious compression artefacts.
– Even, realistic lighting