You can manually add it in, though:
getImage("aqualine-seed");
getImage("aqualine-seedling");
getImage("aqualine-sapling");
getImage("aqualine-tree");
getImage("aqualine-ultimate");

Thanks!

for anyone looking at this, make sure you add "avatars/":

getImage("avatars/aqualine-seed");
getImage("avatars/aqualine-seedling");
getImage("avatars/aqualine-sapling");
getImage("avatars/aqualine-tree");
getImage("avatars/aqualine-ultimate");