No, each tile is 16x16. 50x50 would be very high definintion for pixel art.
16x16 what?
How many pixels each tile is?
When I load the spritesheet in the game engine, writing 16x16 pixels gives me nothing.
If I write 50x50 pixels I can see the sprite
The tile is 16x16...meaning its only 16x16 pixels. You're not using your art program correctly.Get a program like Asperite.