Too gray on my monitor. This looks more like domestic white oak with a grey fill to hide the open grain. I wouldn't choose this product with the many better options available.

All normal charcters of wood. You are going to see character. If, you would like to avoid it and have a more uniform look, use LVP or laminate.

Those are all normal in wood. I'd set aside the board in the first picture that looks like it has a watermark and use in a closet, under a bed, or for a cut.