Jam did a great job of explaining how to reduce the size of the pictures to attach to your posts, however, for cues I would make the pictures a little large so it is easier to see the detail. Again, it depends on the original size of your pictures as to the percentage to shrink them down, these are too small to get a good idea of your cue, which is really nice by the way.
If you want to experiment, there is a "Test Area" that has been set up in the main forum just for this reason. I would suggest experimenting there and once you come up with an acceptable picture size, do it for real.
Dave