I calculate my prices on an hourly rate of 25 € to which I add the price of materials, paypal fees (3,4% +0,25€) and shipping costs.
Plushies between 15-20 cm usually take me around 6 to 15 hours, so the price ranges between 170€ and 400€. The price is an approximation. It may vary depending on the complexity of the character. I will give you a quote for your plush based on your reference images and what you have in mind.
For the size, I accept plushies between 10 and 40cm.
If you haven't any reference, I can sketch your character for you. I'll charge extra cost for it.
For an extra cost of 15€, I will send you a step by step video of your commission (MP4 file).