First time oil of figure drawing

Last week the weather was so bad, I missed one of our favorite models. But this week we had an excellent, new model and hoping he will return again soon!
I started out the night very apprehensive - I was out of my comfort zone and plunging into something I had not done before - oil painting with a live model. I've painted the figure in watercolor, pastel, oil stick, etc. but not with dollops of paint and medium before me, and a bristle brush in my hand. I've painted oils in the studio, even ultra-mini oils which are like playthings. I've painted en plein air (not too successfully very often) in oils, but not the figure in oil. So this first one seems rather tentative, making it look stiff and inaccurate, with a kind of dull sense of expression. - Not what I wanted! -How to move beyond this?