When designing your website with product sales in mind, we recommend that you customize your Buy Buttons for higher visibility so your potential customers don't miss them.
We understand the potential tradeoff here - you're a visual artist, and you want your visitors to be focused on your art, while making your site visually-pleasing with minimal distractions; you might even think your Buy Buttons should barely be noticeable, but consider that your sales might suffer as a result.
Not to suggest that you go off and make huge Buy Buttons with blinking fonts, rather we encourage you to keep in mind why you Buy Buttons on your site in the first place - so you can sell your work.