This is the only place where you are able to enter details of the products, so it needs to be clear and useful so that your payers know which product to pick and provide any relevant useful information.

For example, if it is clothing, explain what the different sizes mean.

You are only able to have one image for the variation too, so if it is a mixture of different items where it will be useful to see an example of each variant, combine these into one picture where possible, even if you have to get creative with Paint.