https://www.udemy.com/course/3dmotive-designing-a-film-quality-fish-bust-with-zbrush-and-keyshot/

In this course on Designing a Film-Quality Fish Bust with ZBrush and Keyshot, we will start by using a very basic mesh to create a unique and film-quality model in ZBrush. Starting with this mesh as a base, we'll learn to use a 2D sketch painted in Photoshop as a reference for fleshing out the main shapes of the 3D sculpt. We will then cover a mix of speed sculpting techniques in order to achieve a detailed surface without adding too many details. This mesh will allow us to eventually focus more on the texturing side, using real photos and hand painting to create an extremely detailed texture map. Next up, inside of ZBrush we'll learn the basics of using Spotlight and focus on understanding the hand painted technique therein. Finally - we'll learn to bridge the gap by bringing the sculpt into Keyshot and then create quick shading, and then breakdown the setup for the materials for our object. We'll then wrap everything up by adding a cinematic light set everything up to create a film quality oceanic monster.