Any Avon products absolutely should be marked as an AD. This is from the ASA'S guidelines:
"This means that whenever you
receive any sort of incentive from
a brand (even if it’s not money –
free products and other benefits
count), or you are
directly connected to a brand
e.g., you’re an owner, employee,
shareholder, director or have any
other commercial or personal
interest (i.e. family and friends),
you need to make clear in any
content where you feature or refer
to the brand, that it’s advertising.
This is the case even when the
brand doesn’t know if or what
you’re creating.
"This means that whenever you
receive any sort of incentive from
a brand (even if it’s not money –
free products and other benefits
count), or you are
directly connected to a brand
e.g., you’re an owner, employee,
shareholder, director or have any
other commercial or personal
interest (i.e. family and friends),
you need to make clear in any
content where you feature or refer
to the brand, that it’s advertising.
This is the case even when the
brand doesn’t know if or what
you’re creating.