I think you have to start by looking at how you develop your negatives. If this is a straight grade 3 print then you couldn't have built much contrast in to begin with. If you're looking for more punch in the highlights you have to start there. Depending on how you expose the negatives, you can add / subtract shadow detail too, which will add / subtract to the 'silvery' look. Many people feel that detail is necessary for a good print, but I am not of that school. I love a thick, rich black that really makes a mark.
Since your scene is fairly evenly lit, perhaps you need to boost your contrast in order to help that arch and its geometry a little bit. It wouldn't be the best technical quality print, but it could be more expressive. I second the opinion from jovo to burn in the sky as well. It is not difficult to do. Just get a piece of paper (opaque) and cut it to the same shape as the rock, or slightly larger, and then you dodge the areas you don't want to 'burn in' (add more exposure to), while those areas that are not covered by your 'tool' get more exposure. If you want to get a good effect with this, it is important to move the cut out tool around so that there are no sharp edges where the burned and not burned areas meet.
I hope that helps a little bit. Try this negative over and over again until you find a solution that prints well. When you're done with it, move on to the next one and make that the best you can. That's the only way to go. Quality over quantity.
- Thomas