It depends on where you are looking from.
If art for you is an activity that you take a step back from the stress generating patterns in your mind and engage with the art from a deeper sense of peace and/or happiness within yourself, then this will relieve stress.
The lover actually is the source of love. Beloved is the key for the lover. It is a game of hide and seek, where the lover pretends the beloved is the key. Yet the lover and the beloved are one and the same, only appear to be separate. Art can be a key. Yet, you are the love. Love will transform your stress into well-being. So, touch your art with love, as yourself and watch the magic at work.