You aren't providing a lot of information on what you are using. If you edit your image so that it repeats cleanly (I don't think it will at the moment) you can set it to Tile a number of times in the Surface settings. Reducing shadow would require another, or a larger, light source.
Since your main lighting is obviously from above, an alternative to adding another light from below as Richard has suggested to reduce shadows, would be to have a reflective object or surface below that would reflect the main light upwards from below.
Comments
You aren't providing a lot of information on what you are using. If you edit your image so that it repeats cleanly (I don't think it will at the moment) you can set it to Tile a number of times in the Surface settings. Reducing shadow would require another, or a larger, light source.
Since your main lighting is obviously from above, an alternative to adding another light from below as Richard has suggested to reduce shadows, would be to have a reflective object or surface below that would reflect the main light upwards from below.