Return to the station and re-take the pictures. You are dealing with the weekend, time is on your side. If they are going to reject your shop they would have already. MF or any MSC wants to get paid. If they don't get paid, YOU won't get paid.
If your photos are "too small', then whatever they are looking for cannot be seen or to small to make out. How close were you from the Subject.
I, don't know the difference in the pixels with a cell phone or digital camera. But I do know that MF have not question any of the photos I have sent them, even when I take the photos from across a 2 to 3 lane street.
If need be change your setting on your photo device. Good luck.