Buttons is a good looking girl, reminds me of the collie I grew up with. He has been gone for 45 years and I still miss him.
We just went through the same turmoil, we had to let both our toy poodles go. They had good lives but it was time. We found Millie, a Shih Tzu/Maltese cross who is the sweetest little girl imaginable. Although she has stolen our hearts, she will never replace Lulu and Gigi but as you say it is time to move on. All the best. I will post a picture when I figure out how.