So you've discovered that one or more of your images is missing. Maybe you got a link to this thread, maybe you found it on your own. Either way, you're wondering what happened. Let's take a magical tour through the relevant portions of the terms of use, shall we?

5. Content Posted using the Service.

a. RoosterTeeth.com may review and delete any content, messages, RoosterTeeth.com Messenger messages, photos or profiles (collectively, "Content") that in the sole judgment of RoosterTeeth.com violate this Agreement or the general spirit of RoosterTeeth.com.
d. By using the Service you agree not to transmit content that:
i. promotes racism, hatred or physical harm of any kind against any group or individual;
ii. harasses or defames another person;
iii. contains or promotes "junk mail" or "spam";
iv. involves commercial activities and/or sales without RoosterTeeth.com's prior written consent such as giveaways or pyramid schemes.
v. contains or provides information about an illegal or unauthorized copy of copyrighted work;
vi. displays pornographic material of any kind;
vii. provides material that exploits people under the age of 18 in a sexual or violent manner; or
viii. provides instructional information about illegal activities.
[Emphasis added.]

Chances are, you had something in your images that wasn't appropriate in a "NSFW" (Not Safe For Work) sense. Exactly what this entails depends on the person doing the judging, but nipples (on a woman) or genitals are auto-deletes. That doesn't mean that you're safe because the porn star you have as your avatar is wearing pasties and a g-string, though. Basic rule of thumb? If you wouldn't want your boss to walk by and see it on your computer screen, don't post it. (If you're too young to have a job, imagine yourself in that position.)

Bottom line? The Images section of your profile was not designed as a porn stash. Keep it under your mattress, please and thanks.