That takes some dedication! Animations are definitely the most time consuming parts of creating a CS army. A few pieces of advice: whenever possible, "animate" by selecting part of your unit and just dragging it around. For example, grab one of your hydra's heads halfway down the neck, move the selection a pixel to the left or right, and then make similar adjustments throughout the rest of the unit. This strategy is especially useful for making death animations since the unit is basically collapsing.
Looking forward to seeing things come together! Keep up the good work!