URGENT - ADVANCED PHOTOSHOP NEEDED

I am in urgent need of an advanced Photoshop expert to edit a photo for personal use. The original setting of the photo is winter, and I need it to be altered so it looks like there is snow in the background. In addition to this, I need another person's legs and feet to be seamlessly edited into the photo.

Highly Realistic Snow Effect:
- The snow effect needs to be highly realistic.

Ideal Skills:
- Advanced Photoshop skills
- Experience with realistic background editing
- Proficient in object insertion and blending

Please only bid if you can deliver a highly realistic edit.