From my perspective, hot girls could alienate women gamblers who make up a sizeable minority. From what I gather women gamblers are more affluent and loyal than their male counterparts so alienating them may not be the right way to go. Pictures of people may work better in the american market, they seem to be swayed more by that type of thing but again not sure if that works in gambling. other than that anything goes, but make it too flashy and you’ll give your readers a headache! just play around with different concepts and you’ll reach a balance.