Good Diet for Healthy Lean Body.

What kind of Diet will be good and beneficial for gaining good lean Body mass with lean muscles. . . I am currently on a normal/regular Diet: At Morning: I have 3 Sandwiches(with omlet) and 1 Glass of Milk with little proteinx as a supplement... . . Afternoon: Boiled Dal, white Rice and Boiled Chicken and sometimes with vegetables and Fruits . . Evening Snack: 1 Glass of Milk with Oats or Museli and sometimes chocolate cake or choco pie . . Dinner: Boiled Dal, white Rice and Boiled Chicken and Fruits sometimes with little Vegetables. . . What Can I Add, Remove or Change from here... At present I am 20 and my weight ranges between 72-75... . . And can you recommend Diet that promotes good healthy skin with an Holistic approach.... . Regards.