Street art always looks ambiguous (in the good sense of the word). This "picture" can be interpreted in different ways. That is not the fact that this mouse is smiling. But if you include the imagination and carefully consider the existing details of the picture, you can come to several logical conclusions.
For example. The owl looks sad or tired, she is immersed in thought. There is a feeling that she is tired of everyday bustle. Why do everyday fuss? Because with this the next detail is bound - a house or a piece of the city above the head of an owl. The city above the head of an owl is a rush of haste or routine and closed prostranstvo. That is, residents of the city are constantly busy with their own affairs and the city for them as a closed space. Therefore, the owl thought about the fact that in her understanding is represented as freedom. That is, in this context, freedom in the understanding of an owl is a mouse.
The mouse looks like she's laughing. Laughter is a sign of joy. Under the mouse the image is similar to a cloud (a green cloud of an addict :) joking) or green bushes. That is, this is another confirmation of the fact that the mouse in this photo is a symbol of freedom. She laughs, there is nothing above her head and under her green bushes. And the owl does not look so happy and there's a head above it and there's nothing under your feet - the opposite of the mouse. The mouse is free and the owl does not.
And now the main conclusion - an owl in my opinion is the interpretation of the urban waitress burdened with everyday life. A mouse is an antipathy. That is, the owl in this context is represented as a city resident who recalls past activities (hunting for mice and green nature). Conclusions to do to you. I wrote it in one breath. The first thoughts that arose after I saw this photo. I hope I clearly expressed my thoughts :)
Thank you:)