Productive for what, exactly? There's a lot of assumed context missing from the post, including your gender, and the gender you're targeting. It's also not completely clear what kind of relationship you want, but we'll assume it's serious and long-term.
First: you're XY, looking for XX. In this case, @swarriner's post is applicable to most of the distribution. But since you're here, we'll assume the girl you're looking for is intellectually gifted, data oriented, and may or may not be slightly on the spectrum. Even in this case, pictures are still worth 1000 words, but a lengthy profile probably won't hurt (it may not help that much, though.) If you're going for someone in the bulk of the distribution, a long profile will most likely hurt, not help. In short, make sure you have good pictures, and don't rely on your own judgement or that of biased parties to assess whether the pictures are good.
Second: You're XY looking for XY. In this case a long profile is probably pretty useful, but your pictures still need to be good.
Third: NB for one, the other or both. In this case a long description is probably generally useful. Don't know enough about this case.
Fourth: You're XX looking for anything. A long profile isn't necessary, just some pictures and a short signal that you're smart and nerdy. The pictures don't need to be that good.
edit: what went wrong here? why is this controversial? anyone can explain?