Soumitra Dutta : Which advanced Photoshop techniques do you use to create realistic lighting ?

Hello Everyone,

My name is Soumitra Dutta, oxford based an entrepreneur, Author & Photographer.  I’m working on improving the realism of my composite images in Photoshop, especially when it comes to lighting and shadows. From your experience, which advanced techniques or workflows have helped you create believable light direction, shadow depth, and overall visual consistency in your composites?