What happens next in this paragraph?

How to tell the difference between subtle, subtly and subtlety 
Use subtle as an adjective. 
The word " subtle " describes a noun that is difficult to notice or understand. Here are a few example sentences : 
The dresses are all wonderful, but their colours have subtle differences between them.

[i] The styles make a certain little detail about a dress the absolute perfect balance between subtle and intermediate. Use subtle as an adjective when referring to a color.;
[ii] The colour blue is a couple of shades darker than blue. The bridal gowns are all amazing in colour, and the bridal dresses look lovely in them.;
[iii] The colours appear to be a very subtle shade of black that contrasts with each other like a murky green. The color is so subtle that it cuts through through everything the whole evening.;
[iv] My mother's warning glance was a subtle hint that i should change the topic. The painting looks drab at first, but there is a subtle beauty in the pattern of brushstrokes.;
[iv]