I am trying to find out what this picture means and where to find it (I could not locate the source). It's really important for me. Thanks everyone for helping.
Appears to be a game called Legacy of Discord: Furious wings. You can see some of the gameplay in this video at around the 1:38 mark (as well as what may be your screen shot around the 2:02 mark). Oddly, the video itself has it labeled as "Legacy of Discod: Furies Wings" but when typing in "Legacy of Discod" Google was suggesting the other title.
As suggested, it is available for iOS (and also android).
Best Answer
It's from a mobile game called Monument Valley.
Source: Google reverse image search