Apple Mail Email Signature Revamp

I'm using Apple Mail on macOS Big Sur and I'm facing issues with my email signature. Firstly, the formatting is all over the place and secondly, the images in the signature are not displaying correctly. I'm unsure if the signature is a custom design or a pre-built template.

I need a professional with the following skills:
- Proficient in Apple Mail on macOS Big Sur
- Able to troubleshoot and correct formatting errors
- Experienced with ensuring images display correctly in email signatures
- Able to analyze the signature to determine if it's custom or a template.