Looking at any subject a LOT while drawing is a good thing. You want to take a good look at the subject, and stay relatively zoomed outwhen it comes to the drawing part. You don't want to get in too close, too much distortion. Also, "...making some markings and lines without turning the eyes away from the subject".. Congratulations, you stumbled upon a technique and you didn't even realize it. My friend you have discovered Contour Blind. It's drawing without looking at your drawing.
Originally Posted by pegasi
One exercise you can do to stimulate your memory is to look at an object for 10 minutes, and then draw for 2-5. I studied under an art professor who did that and he can work very well from memory. I haven't tried it, and I don't know if I plan to, but if you want to give it a try, I'd say go for it.
Doctors heal you, Artists immortalize you.
"Those who can, do. Those who can't, teach" - bullshit.
The usual staples for anatomy: