1: Some or all of the textures appear to be pure black or pure white, which do not display correctly in-game. Instead, you should use very light grey for white, and very dark grey for black, which will still look like black and white in-game but will display properly. For more info, see: Tiptorial: Black and White

3: Some small parts of the textures appear to be pure black or pure white, which do not display correctly in-game. The affected parts are so tiny that it doesn't make a big difference to the overall quality, but in future, you should use very light grey for white, and very dark grey for black, which will still look like black and white in-game but will display properly. For more info, see: Tiptorial: Black and White

5: Your textures don't use any pure black or pure white. Great!