If you look for fictional and realistic planet , you might get this one. there ara bump surface and atmospher with clouds on it. And atmospher, clouds and surface are 3 different materials. Also you can change the colours however you want! It has been animated too.
INFO
BLEND (Blender, filesize: 6.75 MB), OBJ (OBJ, filesize: 615 Bytes), FBX (Autodesk FBX, filesize: 1.84 MB), GLTF (glTF, filesize: 1.1 MB), DAE (Collada, filesize: 8.13 MB)