This time around I'm not available but, considering this is the third time you're searching for an artist but despite the vast number of people that offered on your two older posts (1 - 2) and yet you haven't found an artist...
Do you have a specific artstyle in mind?
What do you consider Professional / High-Quality enough for your standard?
Can you provide a Title or sample of the art style you're looking for so maybe you can narrow down the applicants?
Is there a series whose artwork you liked enough to say that's where you wanna go with your own projects?
If you have to like the art, provide an idea of what that looks like so the rest can have an idea. Of course, this is not to offend you but with each rejection to many people who is in fact high quality and professional enough that I've seen offering, I don't think anyone has an idea here of what you like.