My Puli, called Fred, died 5 years ago, but FredPuli lives on (as you see, above). My poodle Benny died two years ago, and I still say 'goodnight Benny' as I blow out the candle I have at night here and go to bed. I understand your feelings. I have nine dogs here and those two were special, but the nine are part of the family too, just as they were. There's really nothing to feel guilty about. All right, so I am sentimental, but why not? Some people are. Coco wouldn't understand it. I'm sure mine wouldn't and Benny was the dad of most of them! Coco is secure in the family, happy and loved. Coco isn't worrying ! Coco is probably sleeping by now, and chasing rabbits in happy dreams.
It's not so much moving on as staying; nothing wrong with that and nothing to feel guilty about, is there? Keep the avatar. They may come a time when you will remove it without thinking ill of that, and then it'll happen naturally enough but if it doesn't, it doesn't, but don't agonize over the thought. Hey, you may have years yet but it won't matter; what was that Puli again?