Modelling Artist
A 3D modeler creates three-dimensional creations through various computer software. from 2D or 3D art which produced by a Concept Artist, or from reference materials. They also sculpt the model to shape what’s intended. The job work is the entry of the 3D department. After the modelling artist completed their models, it can be moved onto texturing and animating. In smaller VFX studios, modelling and texturing artists might be combined into one job position to do both roles.
They usually create something like this with reference images.
Animator
A 3D animator specialize in creating different types of animated digital models such as humans, objects, or landscapes of an animation. They often start with receiving scripts, visualizing what the animation may look like, and designing the storyboards.
Here is an image of the Animator’s responsibilities from a job post.
And a link to more information about the role’s jobs and what skills are required.
https://au.indeed.com/career-advice/finding-a-job/what-does-3d-animator-do
Texture Artist
The Texture Artists specialize in creating the textures for 3D animated objects for video games, films, television shows, and commercials. They paint surface textures on 3D models such as, animated characters, environments, and props.
This video explains that what exactly a texture artist do in a VFX studio and what makes a good Texture Artist.
Environment Artist
They create background visual arts which actors or objects will interact for films or video games, such as, outer space, historical recreations, and fantasy lands, etc. The role is to create backgrounds, layouts, and environments using computer software to design and sculpt it. The Environment Artist needs to be skilled with a modeling package such as Maya and 3D Max. It is essential to know about Photoshop and Substance Painter for creating textures and materials. Knowing how to use 3D sculpting program such as Zbrush is also an important skill.
Here are some works of Robert Hodri from Art Station, who works as an Environment Artist.
ArtStation – Robert Hodri (His Art Station page)
This article talks about more relevant role description and skills of Environment Artist.
Environment Artist Job Description, Salary, Skills & Software (cgspectrum.com)