This is a game model I made some time back, hand painted and easily importable in Unreal (tested).
Note: I have left the poly count to be high, but you can further reduce it.. and since the model uses image textures, it would look decent still.
2 Texture Map sizes:
PS: I noticed no banding or other effects while using 256x256 ;)
You can request further custom assets by contacting me here, or via discord: SomeAB #4529