I faced several problems today. The first, was to solve the shadow issue with the second shot, where the staircase was leveled to form the ground. Apparently, shadows of the actor weren't visible, thus we decided to use data from another footage and superimpose it on the actual footage with experimental blending modes to form shadows.
Basically, I learnt how use shadows from another footage and superimpose it on the actual with blending modes to make it look realistic.