Visual cue of how good a score is

[glerzing]

When you don't know Tournesol, it is not immediately obvious in the preview whether a score is good and how good it is. For example, the score 18 could be interpreted both as a good or a bad score, especially if you don't know that negative scores are possible (is it 18/100 ? Or 18/20?).

Currently, with negative scores, the sunflower appears grey. Make we could find a further visual cue to make it intuitive how good a score is (different color, appearance of the sunflower, maybe shining more...)

This would be especially applicable to previews, that are more likely to be seen by people that don't know Tournesol, but if it looks good it may apply everywhere the global score is displayed

Feel free to reject the issue if you don't think this is a problem, or find no good design.