While 99% of the images that appear in Bitsboard are wonderful, on rare occasions you might find an image that is not appropriate. If that happens, please do email us so that we can update our system to ensure that this won't happen again.
In any case, if you are using the editor or Board Creator with a child and you want to be 100% sure that no inappropriate images will appear, you can turn the web image search suggestions off by going to Settings > Account.
If you turn image suggestions from the web off, you will obviously get a lot fewer image suggestions but you can rest assured that no inappropriate images will appear.