Upgrade Existing GLB Models - Working for long term with someone

I have several models in .glb format that need a quality lift. The priorities are richer, more realistic textures and cleaner, better-balanced geometry; however, I don’t have fixed instructions on either front and am relying on your artistic and technical judgement to show me what will look and perform best.

You will start from the original .glb files (no other formats are available) and return updated .glb versions ready for real-time use. Feel free to move the assets through Blender, Substance Painter, or any comparable tools as long as the final export keeps the original scene scale and hierarchy intact.

What I will consider a successful delivery:
• Visually improved, PBR-ready textures with no obvious tiling or stretching
• Optimised geometry that preserves silhouette but reduces unnecessary faces
• Final .glb files that load error-free in standard viewers and engines

If you need any quick approvals along the way—say, on a new material style or a topology change—just send a low-res preview, and I’ll turn feedback around fast.