Cessie, the first two photos are of Nala, the third is Deli. Otto is inside when the two girls are outside.
The fourth is definitely no snow leopard, but one of the Amur leopards. I just can't say who of them was outside.
If you want one more snow leopard, I can add Mahnadi, the previous female, who is still in the zoo, but at a different place now
Right now it seems in Estonia they have the same weather as we here in Germany, no snow in sight and temperatures above freezing point. If I have a look now, none of the snow leopards are visible at the cameras, and one of the Amur is outside pacing.
Happy Holidays