How can I make "Advanced" GFX

Heya!!
I’ve recently been wondering how I can make “advanced” GFX.
With advanced I mean stuff like flames, rain, reflections etc
A good example of that I mean is that thumbnail from the game “Tower Galactica”

Reflections can be seen on most of the Character’s heads, same with a “wet” effect. The lighting is also really good.

Does anyone know how I could do such things?

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Anyone? I’d really appreciate it!