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In this first example the subject is seated. She is leaning slightly to her right and is of a slim build. Her right arm is resting just above her knee and her elbow is raised slightly. Notice the shape of her arm. Her forearm appears shorter but it is easy to make out the shape of the extensor and flexor muscles which gives the forearm its shape. Her upper arm is relaxed but the shape of her bicep can still be seen. Her left arm is hanging loosely over her left leg and it is easy to see the shape of the forearm as it rests gently against her inner thigh. Her upper arm and forearm are of equal length and it is easy to see the shape of the elbow.
In this next sketch the subject is sitting on the floor. She is leaning back on her left arm causing her body to twist forward. Her right arm appears straight and is turned in toward her body. It is easy to see the triceps and bicep muscles as they gently curve from under the shoulder to the elbow. Notice how the back of her elbow is visible forming a little bump and how also there is a small indent to the front at the joint. The top of her forearm appears almost flat while the flexor muscles can be seen on the base of the forearm forming a gentle curve from the wrist to the inside of the elbow joint. Notice also how her upper arm and forearm appear to be of almost equal length at three and a half spaces each.
In this sketch the subject is in a similar pose. She has her left leg raised and her right leg tucked slightly under her bottom. Again she is leaning back on her left arm and her body is turned away. She has her right hand placed on her thigh and her arm is bent back slightly making the forearm appear shorter. Her shoulder is raised and it is easy to see the shape of the triceps and bicep on her upper arm. Her forearm is turned slightly, tightening the extensor and flexor muscles and making them more visible. Note again the small bump of the elbow on the back of the arm and the crease at the front of the arm where the elbow is bent.
In this next sketch which is a full frontal seated nude, the subject is sitting upright on the floor facing forwards and is holding her shins. She is leaning slightly to the her right causing her right shoulder to appear lower than her left.Note the proportion of her upper arms. They are both of equal length despite the right shoulder being slightly lower. You can also see the curve over her bicep and triceps muscles as the triceps curve into the back of the elbow. Again there is a visible dip at the elbow where the triceps and extensor muscles meet the elbow joint. Her forearms are slightly different in length. Her left forearm appears slightly longer as she is gripping her shin a little lower than on her right and her left hand is tipped forward more creating more length in the wrist.
In this sketch the subject is squatting with her body turned away. Her arm is straight and the heel of her palm is resting on her knee. As she is of a slim build very little definition can be seen on her upper arm, however notice how her arm tapers toward the elbow. Also note the shape of the elbow joint and how the forearm joins to it. The forearm again has little shape but you can just see the slight curve of the extensor and flexor muscles. Note again the proportion of the upper arm and forearm.