Realistically speaking, buying online is the same as buying from a mail order catalog. Especially with items such as Jewellery, Makeup. Fabric etc...
There may be some differences and an acceptable range for some variances in a product. It maybe noted ("Item may not be exactly as shown", or "Items may vary" etc) I do not know the legalities in regards to if anything is required to be mentioned or not.
Most companies will not spend the resources or take the time for photos of every single item they sell. not realistic & can be a huge drain on manpower & funds that can be used elsewhere.
There has been good advice mentioned by others previously in this thread. Do your Homework & take what they say to heart! I can think of much worse fates than looking at 100+ photos that all look similar.