I guess I have always had a knack for putting pencil to paper and producing something that looks like...well...something, I guess. I do enjoy it, but I have a lower end self esteem thing going on when I show it to others, even when they tell me my stuff is good. So lately, I've been dabbling a little more. I took a low key IT assistant job and have a lot of time to doodle while updates run and installs process. I've been doing some sketches of a friend's animal photos (with his knowledge and blessing), but have also been pretty proficient at sketching other artwork I have seen as well. Sometimes, there's no question as to the source material. I guess my question here is, do I have an obligation to credit the artist I am emulating when it's obvious? I'm talking someone on a local level, not Picasso or somesuch. I'm also an avid beer homebrewer, and have always been told when using a recipe I find on the internet for competition purposes that it's a homebrewing competition, not a recipe writing competition, and that there's never an expectation of crediting the recipe and such. Is there a similar code of ethic in the world of sketch?