You need to consider this an investment rather than a pleasure, you might know about the say "don't judge a book by it's cover" but you also have to consider not everyone wants or is able to read through ten chapters to finally be sure a series has sufficient quality to be worth their time, this is where a Series Cover comes into play, they have to be simple enough to be remembered and recognized at first sight, but they also need to be complex enough to attract the attention of the viewers for them to give it a try.

It could mean a life-long decision, having someone who knows what they're doing is also important, as it's not recommended to change your image every few days, it's not an easy decision, you need to know what you want, the feelings and atmosphere you will give off, and the approach you give to your story.