Can anyone kindly guide me on how White has won in this picture of the end of an OTB game?

Can anyone kindly guide me on how White has won in this picture of the end of an OTB game?

In the picture, it could be either the two simply agreeing to the draw, or black resigning, depending on who has the move. Both are typically followed by a handshake.
White to move is a draw.
[FEN "8/3k4/5p2/3K1P1p/7P/8/8/8 w - - 0 1"]
1. Kc5 {The only move} Kc7 {Again the only move.} 2. Kd5 Kd7= {Both sides are forced to repeat here, and it is a draw.}
Now, black to move loses as black has to cede space, and then material.
[FEN "8/3k4/5p2/3K1P1p/7P/8/8/8 b - - 0 1"]
1... Ke7 2. Kc6 Ke8 3. Kd6 Kf7 4. Kd7 Kf8 5. Ke6 Kg7 6. Ke7 Kg8 7. Kxf6 Kf8 8. Kg5 Kf7 9. Kxh5 Kf6 10. Kg4 $18
Assuming it's black to move this is a very simple win. White has the opposition and a strong king position. I would recommend reading up on the opposition. White can effectively "push" the black king back because black has no alternative. A decent endgame player will see this as a win almost instantly.