hi @Sagnik Kirtan really love your devotion. i wanted to point some few mistakes in your drawings hopefully it'll help you. so on the bodybuilder there are couple of mistakes there, for example the bicep brachi attaches to the bone under the coronoid process and its shape on a very musclura body would be shaped has a square. the pectoralis major or the chest muscle cover up a bit of the corocoid brachii and the clavicule portion of the deltoid covers the chest muscles,plus you showed two muscle i think one is the corocoid brachii but that other one i really can't tell what it is... also when you practice try to train your eyes to see those drawing lines into a three D space i think it'll help the realism in your drawings, your anatomy on that mascular guy was wrong but i hope that you practice and fix those mistakes. stay strong buddy as for the pose on the left there's couple of mistakes... for example the deltoid muscle attaches on the lateral side of the arm the bicipital groove , and the deltoid needs to be thought off as a square, and your proportions are a bit off. the forearm is very long compare to the upper arm. here's some drawings of mine i hope it helps you see where some of your mistakes were made.

They are good drawings. Can you use your knowledge in everyday drawing? Also do you know how the community works here. I would like to meet people but I find it difficult. Instergram is much easier to see what people are doing.