Lets say if I was paying for this, how much would it cost?
Depends on many factors, such as if the artist charges for hours or for workload, if there is a deadline or not, style of the sprite itself, frames of varying sizes, how many redos you request, etc etc.
What I can say with a good degree of certainty is that you won't get a sprite this complex for less than $400, and I'm lowballing
the shit out of it, considering you hire an artist without much history and experience but some skill. A serious, senior artist can charge $100 hourly.
And, always keep in mind we're talking
quality work. There is a reason why AAA developers have mostly dropped pixel art -- it's hard to make good pixel art, it takes time, and it's not cheap.