How to create a high-quality cover for an indie game on a PC?

Question

Design

Hello.
It's time to make the main cover art for the game with the hero and the environment. This art will be made for Steam and for the cover of the disc (oh dreams).
Some recommend making 3D scenes on the engine, others - drawing separately.
In general, this is a 2D metroidvania on PC with a lot of adventure, not dark fantasy.
I know that creating a cover is a whole art, where the color and size of objects are important. I know that properly drawn art will help attract more attention to the project when a person sees a beautiful picture in the first place.

A couple of examples from similar projects

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It is very necessary to consult a specialist who has already created covers. We will be very grateful for your help.

Answer 1

Freelance for you. And nothing else.

Answer 2

Guys, I read the question. You would have a designer and an artist in the team, without them now it’s impossible :) Most likely, there they have something to work on besides the cover if you want to succeed.

Answer 3

let's sketch = estimate.
Otherwise, it's a conversation about nothing.