To make a sentence in Engpsh using the phrase "to stare at," you could say "I stared at the painting for a long time, trying to take in all the details." This means that you looked at the painting very closely and intently, paying attention to all the small details. Another way to say this could be "I fixed my gaze on the painting, captivated by its beauty." This suggests that you were so fascinated by the painting that you couldn't look away.