I always use the Etsy Handmade search bar to look for popular shopping terms and then incorporate those key words into my title and tags - especially with art which so saturated.
I use a process of elimination based on color, topic, texture, medium, size, etc... and go from there. For instance, if blue comes up 1st in an art search vs. canvas or my topic, I'll start my title with "blue" and work down the key word popularity scale from there. Hopefully this makes sense? :-)
Reinforce your title with similar tags to = most relevant - and for the holidays maybe gifts under $10 since your prints start at $3?