Word for something that stands out

It seems to me eminences and prominences are the only nouns for things that stand out and are positive, but they'd both stick out like HotLicks's sore thumbs. Perhaps we've never felt the need to name such things with a single word.

"Three things that stood out" is perfectly plain English. You could say they became clear or were apparent, or call them noticeable things or prominent features, or choose your adjective from Lexico's noticeable, perceptible, discernible, detectable, distinguishable, observable, perceivable, visible, easily seen, appreciable, recognizable, notable, distinct, evident, obvious, apparent, manifest, patent, plain, clear, clear-cut, marked, significant, conspicuous, unmistakable, undeniable, palpable, pronounced, decided, prominent, salient, striking and arresting, but "three things that stood out" is fine in any context.

You could try:

identified

as in

These are the three features I identified with the most

From TheFreeDictionary:

to associate oneself with or admire something, such as a set of ideas

Those are just three highlights.

the best or most exciting, entertaining, or interesting part of something:

Highlights of the match will be shown after the news.

— https://dictionary.cambridge.org/dictionary/english/highlight?q=Highlights+

Those are just three of the: Attractions, enticements, temptations, seducements

Attraction: (4) something that attracts or is intended to attract people by appealing to their desires and https://www.merriam-webster.com/dictionary/attraction

Temptation: the act of tempting or the state of being tempted especially to evil https://www.merriam-webster.com/dictionary/temptation

Enticement: c. 1300, "thing which entices," from Old French enticement "incitement, instigation, suggestion," from enticier (see entice). From 1540s as "action of enticing." www.etymonline.com/search?q=enticement&ref=searchbar_searchhint

seducement: something that serves to seduce https://www.merriam-webster.com/dictionary/seducement