I draw from references most of the time and I blame it on my lack of skills and techniques in illustration.
Had I been more attentive and put in effort during those art lessons back in school, I would probably google less when trying to draw human anatomy now.
An idea or concept comes to mind and I find it challenging to successfully depict in pictorial form just from imagination.
I would struggle and in the end, rely on google to get assorted images that would 'piece' together nicely to express my idea/concept. These form my 'collection of references' before an abstract idea conceptualises to visible marks on paper.
Made little attempts at times (such as the illustrations above), to draw solely from imagination. I would definitely need more practice and confidence to do this more often!