I made a similar tutorial a little while ago but, realized it needed to be updated so I re-worked the design and made some improvements and think you will truly enjoy this tutorial. I think I answer most of your questions regarding brush size for my flowers.
As far as applying glitter I usually do this prior to outlining but, in this tutorial I didn't want to distract your eye from what I was doing. I hope you enjoy it. If you have any questions or comments please leave them here or on the video.
I used Soulfire and Shamrock splitcakes by Cameleon
Wolfe white and black for the details and Tag pearl yellow for the base.
Brushes used 1/2 inch flat, #10 flat by Royal & Langknickle
#1 round by Princeton art & brush co.
Purelight glitter by Face n Body Art.
