I've updated My Patreon Information Page, so hopefully this will help Answer Anything & Everything anyone may be wondering about My PATREON.
July 2018 UPDATE:: There are currently *14* UnFILLED STYLE-THEME SLOTS... Soooooo, if anyone has any Styles-Themes/ Clothing- Genres/ Or General Theme Suggestions (which are Not Currently Listed), Please feel free to post a Suggestion.
Sept 2018 UPDATE: GOTHIC has been added to SLOT #1 (the $125 Slot)!
... And since once I have drawn one of those styles, it is then unavailable to be voted for again for '4 cycles', this helps add variation, rather than the same style choices being created month after month.
In regards to the other part of your query:
The style choices are only available to be voted for as long as the Amount is 'the same as, or over' the milestone goal...
So if the amount was to then drop back under $300, then the Vintage 70's style choice would no no-longer be available to be voted for.