Urgent Pixel Cleanup, PNG Enhancements

I have a handful of PNG files that need swift, precise attention. First, I want every stray or discoloured pixel removed so the images look perfectly clean on any background. Right after that, I need a few subtle elements added purely for visual enhancement—think small highlights, gentle shadows, or other tasteful touches that lift the overall polish without changing the core artwork.

All edits must:
• Stay in the original dimensions and resolution.
• Preserve transparency where it already exists.
• Be delivered as layered PNGs so I can toggle the new touches on or off later.

Please share one cleaned-up sample from my files within the first few hours so I can confirm the approach, then finish the remaining images right after approval. Looking forward to a quick turnaround and crisp, professional results.