A lace collar of fine workmanship would be highly valued and wearing it was a means of showing off and declaring one's wealth. The laws were usually ignored or circumvented. Why should false painting imitate his cheek, 5. Possibly portrait painting. The practice being castigated is that of artificially attempting to fake a beautiful face, using face painting, in order to copy the beauty of the youth on one's own cheek.
Portraiture seems to be less of a target than the vanity of self adornment.
See Sonnet 20. 7. Why should poor beauty indirectly seek 7. Poor beauties are presented as copies of the real thing, the ideal form of the rose itself, from which they have to borrow their characteristics. The youth is the absolute and true Rose, the Platonic abstract form of rose, on which all others are based. Hence what they achieve in their quest is limited and they are only roses of shadow , or have achieved such characteristics, but never the real thing.