Attn Wedding Vendors - Looking for feedback on tipping.

Hello All,
I'm working on a general tipping guide for my brides and I wanted to
compare it to what vendors really think. Here's the question(s):
How do you feel, address, or think of tipping (from brides) for your services? Expected? Optional? How much? When?
Thanks in advance.
--
Jazmyn Chandler
Love Always Weddings
www.LoveAlwaysWeddings.com

P.S. I'm a wedding planner