In the first image, the building on the left is the Air India building and the one on the right (sideways) is the Oberoi Towers Hotel building. Next to it, the shorter building on the far side is the Hotel Trident (belongs to the Oberoi group). The last high-rise building on the right of the image is an apartment building called NCPA Apartments, one of the most expensive piece of real estate in Mumbai. A small part of Marine Drive is visible in the picture.
The second illustration is a closer view of the Oberoi Hotel and NCPA apartments.
Related Images: Sketch and Silhouettes of the Taj Mahal Hotel in Mumbai
Skyscraper Sketches (residential towers) or more pencil drawings of residential high-rises: Sketches of high-rise apartments or Drawings of Mumbai Skylines - South Mumbai, Malabar Hill and Worli
Or see Skyscraper Silhouettes