For me, asking “what else can I see?” has been useful. Some of my favorite works of art show me new things every time I look. Garry Winogrand’s 1964 is my favorite book of all time, I’ve gone through it dozens of times and always find a new photo to appreciate.
I also find it helpful to avoid labeling art as “bad” and instead say “I do not yet understand this work, but someday I might”. I didn’t get that Winogrand book at first, had I written it off I would have missed out. I still don’t get Cy Twombly, but I hope to figure his paintings out someday.
The more art you look at, the better you get at looking at art!