I can tell that the petals on the right earring are slightly more than those on the left earrings, only after I examined the photos closely to look for what you observed. Per my own experience, any difference seen in a photo is much more pronounced in real life. Once, I received a pair of custom-made earrings with cast metal work (which is expected to vary slightly in size due to natural manufacturing variation). The size difference bothered me a lot, especially that I am extremely picky about straightness and symmetry. Like you, I posted the earrings online and asked for opinion. Majority of the respondents said they could not see any difference, and told me the asymmetry should be less when worn on separate ears. At the end, against everyone’s advice, I returned the earrings to have them recast and remade. Glad that I did. The new earrings were many times better, and I was thrilled. I enjoy wearing my earrings every time.
Do not feel uneasy about returning the earrings. Not only are they expensive, but also that they must make you happy wearing them every time.