Based on the images you showed, it seems like those characters are using rigs because you can see the smooth bend on the elbows and knees:


Resources
I made a video on How to make GFX a while ago, it may be a bit outdated but the process is almost the same (i plan to make an updated video soon).
There are also some recent videos by other creators on YouTube showing how to make renders like these!
If you are looking for a Rig that works with blocky and 3.0 woman bodies, I made my own rig that I’m happy to share with you if you need it!
P.BlockRig_V2 .blend (1.2 MB)
P.WomanRig_V2.blend (1.8 MB)
Quick Tutorial
Here’s a quick beginner friendly tutorial on how you can achieve renders like these. I hope it helps!
STEP 1 - Import To Roblox
Insert your character into Studio using the Load Character Pro plugin.
- Make sure “Spawn at Origin” is checked and select “R6”
- The character must be on top of the floor

STEP 2 - Export Character
- In the Explorer panel, select all the Head Accessories + the head of the character.
- Right-click and select “Export to obj”
- Save the obj file in a dedicated folder for the project (just to keep things organized)
Because of the new Dynamic Faces update, all the classic roblox faces are not 2D decals anymore so we want to export the head that comes with the face attached to it`

STEP 3 - Import Character to Blender
Import the character to Blender
- Go to
File > Import > Wavefrom (.obj)
- Locate your .obj file
- Make sure “Split By Group” is checked before importing

STEP 4 - Parent Hats to Rig
Now we need to parent the hats + head to the rig so we can move them!
- Select and delete the head of the rig (Pres “x” on your keyboard to delete)
- Holf
Shift and select all accessories first and the hat attachment last (little empty cube)
- Press
Ctrl + P and select “Object”


STEP 5 - Add Charcter Texture
Change into Material View
so that we can see the texture on our character once we apply it
- Go to the Shading tab and select the torso
- Click “Open” in the Image Texture node and locate the texture

STEP 6 - Pose Character
Now you can pose your character!
- Go back to the Layout tab
- Select the rig controls
- Change “Object Mode” to “Pose Mode”
You can now move around the limbs of the character by selecting the controls around certain parts of the body


>STEP 7 - Simple Lighting
You can have a preview on how lighting will look like if you go to the Rendered View 
Go to World Properties and change the colour to white, or adjust it to your liking!

From here, you can leave it as it is or experiment more by adding lights to your scene
Shift + A to add lights (make sure you are in Object Mode before adding anything to your scene)
- You can adjust the lights in the Object Data Properties

You might need to change the World colour back to a dark gray so you can see the lights in your scene
STEP 8 - Adding Camera (IMPORTANT)
Now the most important part is adding a camera to your scene so you can render!
Go to “Object Mode”
Shift + A and select “Camera”
Select camera > right click > “Set Active Camera”

Adjust the view in your scene and have the camera copy your view by going to View > Align View > Align Active Camera to View

You can adjust the resolution by clicking the “Output Properties” Icon
I made mine 1080x1080 so I have a square image, but I recommend cropping the final rendered image in a separate editing software to have a 1:1 aspect ratio (if u want) and keeping the resolution at 1920x1080 to avoid low quality
You can also adjust and move your camera around with the move tool or the camera settings
STEP 9 - Render Settings
Before rendering, make sure you have these settings.
We want to have “Transparent” checked so your final render doesn’t have that gray background. “Noise” is also turned on so we can have the cleanest image possible
You can also change the Samples to 1000 or higher, or leave it at the default number. I recommend not going above 2000 if your computer isn’t as powerful, but you can play around and test it
The sample number allows you to have good quality image with out it looking grainy
STEP 10 - FInal Render
FINALLY we can render 
- Go to
Render > Render Image and wait for the image to render
You can see the sample count at the top of the render window to see if your image is done rendering
- Now you can just
Image > Save As and you’re done!


Questions?
Let me know if you have any questions, I’m happy to help!
Sorry for making this so long lol TvT
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