As mentioned above, this is pretty normal. It is rare that a product makes it from sketch to shelf looking the same… and if you think about it, it makes sense. As you are building it in CAD, hopefully you are not just acting as a CAD monkey, but as a designer, taking every opportunity to learn, refine, and design.
A couple of “post documentation” sketches never hurt and it is a quite common practice. You would be surprised how much this is done… all those super hot car sketches you see are usually drawn over top of final CAD after the design has been worked out and refined. It reinforces the mythology of design, but is also fun.