I'm not an expert but it seems to me your ISO is too high. When I take my moon shots I use a tripod, set the ISO to 200 on Aperature Value so that the camera makes all the necessary adjustments with the shutter speed etc. And I set the white balance to daylight. I know that sounds funny because you're shooting the moon, but the moon doesn't produce its own light- it reflects the sun. Depending on how much detail I want in the craters etc. I will adjust the exposure- less exposure brings out more detail (the - side of the scale); more erases the detail (the + side of the scale). Needless to say, I under-expose more than over-expose. Sometime 0 works, but more often than not I'm at -1 or -2. If I don't use the tripod I can sometimes get away with handheld at 400 ISO, but the best shots are always the lower ISO of 200 (or 100) with a tripod. Maybe that might be something you'd like to try with the next moon shot you take. This is still a really pretty shot!
But I still love this picture.