I am looking into offering art again and wanted to offer some pieces drawn by myself.

If I use a reference image for a drawing does that still need to be credited? Like I'm not physically incorporating it into the artwork (like a photomanip) but referencing the pose of a horse, for example.

I have no problem with crediting, just want to clarify :)

If you are using an image for a reference/guideline, it has to be credited and also has to have stock so basically the same rules as normal manips :)