It is not compulsory to frame my paintings, but if you like a more traditional look that is of course an option. Take this into consideration when choosing a size canvas as frames add a few inches to all dimensions.
I do not ship my paintings framed as they would be more expensive and more likely to get damaged.
To preserve paintings better varnishing is an option. This cannot be done until several months after the painting is completed, so I'm happy to either hold onto the painting for you and varnish it free of charge, or give you all the information you need to do it yourself.