My prices vary depending on the project as each one has different requirements. A minimal motion graphics video with just text will cost less than an animation full of characters walking around detailed environments. A simple black and white drawing will cost a lot less than a realistic, detailed painting.
I give a quote for each project based on its complexity, how much time it will take to create plus any additional costs such as music and voiceover artist hire.
I talk with each potential new client to scope out the project and give an estimate of time and costs. Then if the project goes ahead, we establish a brief together, agree on costs, write a schedule then we begin work!
You can also do a search for “Freelance rate calculator” to work out how much you should charge as a business to cover your annual salary, business expenses and tax. This will vary by country and region which is why I recommend searching for one so you can find one relevant to you.