Great for organizing characters & keeping track of who drew what. HTML & CSS (CSS is premium but premium is inexpensive if you think you need it) customization is available. Very much a site where you don't have to be public or noticeable if you don't want to. Just don't make things public and/or use automatic watermarks and bam.
Do keep in mind this site has virtually no staff response to save you if something happens. Watermark your images so nothing gets stolen, don't interact with minors as an adult and vice versa, don't fake your age if you're a minor, and don't upload anything that doesn't belong to you and you should be fine.