In general, try to use colour photos rather than black and white.
Just as people prefer to watch modern colour films rather than old black and white films, so the aim is to make Lingopolo as high-quality, fresh and modern as possible.
Sometimes, of course, it is not possible to find a colour picture to illustrate the word or phrase. In that case, go ahead and use the black and white version.
Colour photo, good:
Black and white photo, not so good:
