Technicality/20
Creativity/30
Detail/20
Aesthetic quality/30
or if you really want to keep the preference thing
Technicality/20
Creativity/25
Detail/20
Aesthetic quality/25
Preference/10
The reason technicality is low is because the most techincal screen still may not look the best.
Same thing apply to detail, the point is not to have as much as detail as possible, but to make it look good (no, that's doesn't have to be equal). Ergo max points in my proposition for both are even.
I believe the preference thing is wrong, because just because judge doesn't like it, it doesn't mean it's bad. If someone doesn't like piano sound (in general) does it mean that piano sounds bad?