Your idea of twink as having feminine characteristics is not universally acknowledged. homorazzi.com's Beginner's Guide to Gay Labels does not agree -
Twinks are generally quite young (18 to mid-20’s), skinny, have essentially no body hair and may frequently be found applying foundation or fake tanning lotion. Generally, they act as though the entire world revolves around the fact that they are young and gay.
InternetSlang.com says -
The definition of TWINK is "Boyish gay man"
Even wikipedia's Gay Slang definition is -
Twink is a gay slang term used to describe young men in their late teens to early twenties. Usage of the term varies, but traits attributed to twinks can include attractiveness, having little or no body or facial hair, a slim to average build, or appearing to be younger than their chronological age.
christianpfc (January 10th, 2017)
Probably yes for the one on the left. Maybe not for the one on the right.
The following one is what I consider to be a fine example of a twink. Slim, smooth & not wasting his time body building.
He just happens to have long hair, but would equally well fit my image of a twink if it were cut short.
arsenal (January 13th, 2017), christianpfc (January 13th, 2017), fountainhall (January 12th, 2017), Up2U (January 13th, 2017)