Introduction
The model is made after Russell Viper in the real world and two sets of texture maps are available, which can be changed as per your need. There are multiple 4K maps, multiple unlooped animations. It's made with Blender and Cycles renderer.
The model consists of 7 objects: Body, gum, teeth, pupils, sclerae, tongue, scales.

Polygons
Body: vertices 25,964; polygons 25,962
Gum: vertices 672; polygons 644
Teeth: vertices 1,720; polygons 1,682
Pupils: vertices 1,220; polygons 1,280
Sclerae: vertices 964; polygons 1,024
Tongue: vertices 512; polygons 506
Scales(total): vertices 1,874,169; polygons 1,677,398
Total: vertices 1,905,221; polygons 1,708,496

Formats
There is a Blender project and an OBJ file without animation, which is rotated 90 degrees over the X axis by default.

Textures
JU0L908A2_RussellViper_Bell01Scale01_BaseColor.png, 4096*4096
JU0L908A2_RussellViper_Bell01Scale02_BaseColor.png, 4096*4096
JU0L908A2_RussellViper_Bell02Scale01_BaseColor.png, 4096*4096
JU0L908A2_RussellViper_Bell02Scale02_BaseColor.png, 4096*4096
JU0L908A2_RussellViper_BellScale01_Normal.png, 4096*4096
JU0L908A2_RussellViper_BellScale01_Specure.png, 4096*4096
JU0L908A2_RussellViper_BellScale01_SSS.png, 4096*4096
JU0L908A2_RussellViper_BellScale02_Normal.png, 4096*4096
JU0L908A2_RussellViper_BellScale02_Specure.png, 4096*4096
JU0L908A2_RussellViper_BellScale02_SSS.png, 4096*4096
JU0L908A2_RussellViper_Body_Normal_1001.png, 4096*4096
JU0L908A2_RussellViper_Body_Normal_1002.png, 4096*4096
JU0L908A2_RussellViper_Body_Normal_1003.png, 4096*4096
JU0L908A2_RussellViper_Body_Specular_1001.png, 4096*4096
JU0L908A2_RussellViper_Body_Specular_1002.png, 4096*4096
JU0L908A2_RussellViper_Body_Specular_1003.png, 4096*4096
JU0L908A2_RussellViper_Body01_BaseColor_1001.png, 4096*4096
JU0L908A2_RussellViper_Body01_BaseColor_1002.png, 4096*4096
JU0L908A2_RussellViper_Body01_BaseColor_1003.png, 4096*4096
JU0L908A2_RussellViper_Body01Scale_BaseColor_1001.png, 4096*4096
JU0L908A2_RussellViper_Body01Scale_BaseColor_1002.png, 4096*4096
JU0L908A2_RussellViper_Body02_BaseColor_1001.png, 4096*4096
JU0L908A2_RussellViper_Body02_BaseColor_1002.png, 4096*4096
JU0L908A2_RussellViper_Body02_BaseColor_1003.png, 4096*4096
JU0L908A2_RussellViper_Body02Scale_BaseColor_1001.png, 4096*4096
JU0L908A2_RussellViper_Body02Scale_BaseColor_1002.png, 4096*4096
JU0L908A2_RussellViper_BodyScale_Mask_1001.png, 4096*4096
JU0L908A2_RussellViper_BodyScale_Mask_1002.png, 4096*4096
JU0L908A2_RussellViper_BodyScale_Normal_1001.png, 4096*4096
JU0L908A2_RussellViper_BodyScale_Normal_1002.png, 4096*4096
JU0L908A2_RussellViper_BodyScale_Roughness_1001.png, 4096*4096
JU0L908A2_RussellViper_BodyScale_Roughness_1002.png, 4096*4096
JU0L908A2_RussellViper_BodyScale_Specular_1001.png, 4096*4096
JU0L908A2_RussellViper_BodyScale_Specular_1002.png, 4096*4096
JU0L908A2_RussellViper_Head01Scale01_BaseColor.png, 4096*4096
JU0L908A2_RussellViper_Head01Scale02_BaseColor.png, 4096*4096
JU0L908A2_RussellViper_Head02Scale01_BaseColor.png, 4096*4096
JU0L908A2_RussellViper_Head02Scale02_BaseColor.png, 4096*4096
JU0L908A2_RussellViper_HeadScale01_Normal.png, 4096*4096
JU0L908A2_RussellViper_HeadScale01_Roughness.png, 4096*4096
JU0L908A2_RussellViper_HeadScale01_Specular.png, 4096*4096
JU0L908A2_RussellViper_HeadScale01_SSS.png, 4096*4096
JU0L908A2_RussellViper_HeadScale02_Normal.png, 4096*4096
JU0L908A2_RussellViper_HeadScale02_Specular.png, 4096*4096
JU0L908A2_RussellViper_HeadScale02_SSS.png, 4096*4096
JU0L908A2_RussellViper_Pupil_BaseColor.png, 4096*4096
JU0L908A2_RussellViper_Teeth_BaseColor.png, 4096*4096

Rigging
Full controllers are available to make it easier to handle. The features are as follows:
CTR_Chin controls opening and closing of the mouth.
CTR_Eye_Root controls the rotation of the eyes.
CTR_Tongue_Route controls the sticking out of tongue.
CTR_Tooth_Roll controls the teeth.
CTR_Head controls the rotation of the head, and comes with the customized attributes: IK/FK Controller Switch.
CTR_IK_Body_01~10 control the body.
And more …

Animations
JU0L908A2_RussellViper_Animation_2.91.2.blend includes 10 unlooped animations at 30fps, and each contains 100 frames.
No scale is included in this project for running faster.
JU0L908A2_RussellViper_Crawl_2.91.2.blend comes with scales and an animation: Unlooped crawling animation at 30fp, frame range 0-100.
The scales need to be enabled manually.
Notice: The animation can be exchanged with JU0L908A2_RussellViper_Crawl_2.91.2.blend.

Features
The model is in meter units at real-world scale.
The scales of this character are real mesh models.
SSS effect is lowered to improve rendering time. And you can raise it back for a more realistic effect.
The model can be directly rendered in the current project.