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youtube has a liked videos feature despite you can save videos to your own playlists including one called Favorites
pretty bad huh
So just use the favourites button as @cgsweat suggested
Why are you using +1 if you want it to appear in a list representing favourites.
YouTube liked videos is equivalent to favourites here
That's the intended use. +1 means you think it's a good pic but not so much that you'd add it to your favorites list. If you had a list for +1's it kind of defeats the purpose, and you may as well add it to your favorites rather than hitting the +1 button.