Exact 2D to 3D Characters

I have a finished set of character illustrations and now need each one rebuilt as a high-poly 3D model for use in a game engine. The final files must be delivered in clean, game-ready FBX format and remain faithful to the original art style—proportions, colours, and surface details should match the 2D source precisely. Because these models will be integrated by our in-house team, I only need straightforward, functional rigs (root, spine, head, arms, legs, and simple facial/jaw controls) with no animations attached. Good topology, logical naming, and neatly packed UVs are essential so we can handle any optimisation or LOD work ourselves later. Please work in whichever toolchain you prefer—Blender, Maya, 3ds Max, ZBrush, Substance, etc.—as long as the exported FBX opens flawlessly in Unreal Engine and Unity. Include all textures (base colour, normal, roughness, metallic, AO) in a clearly organised folder structure alongside the models. Before we wrap the project, I’ll compare every angle of the finished sculpt to the original artwork to confirm visual parity and ensure the basic rig behaves correctly in a quick test pose. If the 3d FbX file is not exactly the same as the 2d we will not pay