Modeling an Arm

Hi folks,
first let me only say thanks for your help in the past weeks, it was very helpful to get some
feedback:eyebrowlift: Now, i simply dont know how to make my modeled arm look musculuar ( not that extreme as bodybuilders) , realistic , just want to give it a nice look…
The question is, whether the biceps is too thin and the triceps doesnt lool that defined either… or what do you think about it? Oh… and is the arm , qite at the beginning to small?

I am lookming forward to every feedback you gime:eyebrowlift:
Thanks for your help
Clark2007

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