The Bengals current helmet design is an interesting one. It is tiger striped, which should generally look pretty cool, but it feels a little too childish or cartoonish due to the size of the stripes and their lack of sharpness. The design on the top right fixes this by adding sharper lines to the tiger stripes and also adding two tiger eyes on the helmet. The tiger eyes are a little too detailed, making them a little unclear though.
The bottom left design is a little too artistic for its own good. It might make a good poster, but when viewed from up high in the stands, it will just look like a jumbled mess. The bottom right is the most modern design, using big block colors with just a little bit of design used sparingly.