I realized that when I took a closer look. You could go with the excuse that they fill up slowly with holes becoming bigger and bigger. Whether or not they stay horns or become tentacles is your choice.
No problem! Im kinda new to this website if you haven't noticed so right now I'm just trying to get the hang of it. Hopefully I can get some artwork on here soon. If I do, comment away! Lol and don't be scared to tell me if you think my drawings suck. XD