Why does Alucard have so many eyes? When showing his power, Alucard tends to exhibit multiple extra eyes.  I'm wondering if this signifies something.  I've seen this trope in other Anime before when somebody or something is being shown as being powerful and creepy.  I want to know if there's some sort of deeper meaning than that.
Alucard has so called release states those make him less weak. In the manga (Chapter 9 Page 23), when he uses them the first time, you can clearly see that a lot of eyes open on his whole body. The eyes that you see on the picture are most likely the same ones. The reason why he has them is unknown.

It could be that all those eyes belonged to other humans that he consumed during his lifetime. However, this is just an assumption.