You will probably draw arms more than anything else, so let's learn a simple trick to construct them.

Start with a Simple Tube

I always start with the gesture, which is basically a tube. The forearm muscles wrap around the bones, so thinking of the arm as a tube is a great starting point.

1. Begin with a simple, gestural tube shape.
2. Refine this into two clean lines.
3. At the end where the hand will be, fan the lines out slightly. This prepares you for connecting the hand later.

Creating a Schematic

Once you have your tube, you can create a simple schematic to place the muscles accurately.

Find the Deltoid: Divide the tube in half from the shoulder to the elbow. The top half is where the deltoid will be. The deltoid is the shoulder muscle that attaches to the acromion, the bony tip of your shoulder.

Define the Elbow: At the elbow joint, draw an 'X'. This simple mark helps you create the elbow and separate the muscles of the upper arm. One line of the 'X' helps define the bottom of the bicep, while the other helps define the tricep.

This schematic gives you a clear map for the major muscle groups.

Placing the Main Muscle Groups

With your landmarks in place, you can start carving out the muscles.

The deltoid sits at the top of the arm. It has three parts: the anterior (front), medial (middle), and posterior (back).

On the front of the upper arm is the bicep. On the back is the tricep. Between them, you'll find the brachialis and the brachioradialis.

On the forearm, you have the extensors on the top surface and a small muscle near the elbow called the anconeus. The flexors are on the underside of the forearm.

Understanding the Deltoid

Think of the deltoid as a three-part system.

• The medial deltoid sits in the middle and creates a V-shape around the acromion.
• The anterior deltoid connects to your clavicle (collarbone).
• The posterior deltoid attaches to the spine of the scapula (shoulder blade).

Understanding these connections helps you draw the shoulder from any angle.

Practice Drawing Arms

Let's put it all together in a practice exercise.

1. Draw your tube with a bend for the elbow.
2. Divide the upper arm in half to place the deltoid.
3. Draw the 'X' at the elbow to separate the bicep and tricep.
4. Use these guides to carve out the muscle shapes. Think about negative and positive space to make the forms feel real.

When an arm bends, the bicep will bulge and become more prominent. The tricep will still be visible on the back, and you might see the bony part of the elbow, the epicondyle, stick out.

Repetition is key. Keep practicing this method to build your confidence in drawing arms.