Today we are going to illustrate an illustration using only Adobe Photoshop.

Let's go. Create a document.



Create a layer and overlay the layer with gradient.







Here we have our yellow gradient.



Create a copy of this layer and apply gradient overlay in layer styles.







Here is the result. Looks like a belly.



More detailed view. As you can see it even has some solid texture.



Now I will add second layer style: color overlay.