How to draw fan-arts of complex characters?

I want to draw fan-arts of the characters I like.

However, I'm not good at drawing, all I could draw is stick figures.

Therefore, I could draw simple characters like Rick and Morty or The Simpsons, but not complex characters Genshin Impact.

I tried, but it takes too much time and it doesn't even look like actual Genshin characters.

How do I overcome this?