Design needs.
The general idea of 'giant insectoid ant-like alien' is kept to. The central figure/largest present on the cover should be one of the antlike aliens inside a sort of skiff, or hovering sled, armored or otherwise protected while riding and leading the charge. The upper torso 'revealed' or armored while the lower abdomen/bottom half is secured within the vehicle. The most important aspect is only that a larger central alien is present and within some manner of human machine used for travel. A mixture of alien ants and humans should be present around this central figure, the ants either bare or in rag-tag scrap armoring using only their front limbs or carrying primitive weapons like spears and slings, while humans present should be enclosed in space-age like armor. Any humans present should be in full covering helmets

The scene should preferably be in some manner of activity, under attack or preparing to attack.