I credit freestuff and sometimes purchased stuff. for purchased stuff I don't really have a set rule for it, i just sometimes do and sometimes don't.
As for stuff I modeled myself, I always mention that in my image description, and I usually say what program I used to model it.

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Jeff

Renderosity Senior Moderator

Hablo español

Ich spreche Deutsch

Je parle français

Mi parolas Esperanton. Ĉu vi?