How do you make images for character models?

[clearifies]

How do I make a character image like shown in the example below?

Example:

[From RBLXWARE]

[OblekfacePC (Someoneslamp)]

I think you are referring to a Viewport. A GUI Frame that can render 3D objects within its space.

Viewport Frame Documentation:
ViewportFrame | Documentation - Roblox Creator Hub