If Neptune is a higher octave of Venus, does that mean Neptune Trine Ascendant will make you charming too?

Yes, it could especially if it involves a tile. There are so many things that create magnetically attractiveness. Venus and their aspects, and exalted mars, moon, jupiter or even pluto. The Parana point, asteroids (which there are thousands, and hundred which could involve romance and attractiveness). Chart patterns, especially patterns such as a pentagram, star of david, or rosetta. Those are just a few I can think of at the top of my head, and just finish teaching an astrology cl, so a tad tired right now. Hope I have provoked a little thinking.