It will actually be different on every ANN thread you see in the forum. But users like me will always look for two things and that is design and information. Sometimes design is important as people tend to read more what is on a infographic rather than the text itself in the ANN thread so it is important to put the crucial details inside a infographic. You can look for the Ann threads itself in the
Altcoin and
Gambling section for you to have an idea. Generally speaking to a campaign manager can also help you with your design problems as they are also affiliated with some graphic designers of their own.