What dictionaries are available that contain separate illustrations for most of the terms? I would prefer something in online or digital format.
The Yale Picture Dictionary has a version for Chinese. This is a small dictionary for learners. It has basic words organized into categories (such as colours, animals, etc.). This is a dictionary to find new words to learn, not a dictionary to look up things in.
I have not used the Chinese version much (yet!), but I did use the Greek version extensively in the past and found it quite useful as a beginner. It is designed in a way so you can also use it in a similar way to flashcards ("do I remember what to call this thing in this picture")?
There is a similar illustrated vocabulary collection at LanguageGuide.org, just suggested to me by a friend. I have not used this (yet).