Well the thing is, I've been drawing with graphite pencils for about 12 years now (or whenever I started kindergarden) and I think my drawings are quite respectable in quality and in
detail. However, upon getting a feel of how oil on canvas works, I discovered no accuracy/detail is possible. Look at the detail in this:

I had assumed this was oil on canvas but now I'm quite unsure. If it was, then that must've been one huge canvas. I'm not sure how to post my question. I'm thinking perhaps I'm using the wrong brushes (even though I bought the finest (in diameter, not price) one), or wrong surface, just something!