This is a very individual response and depends on many factors - body style, age, diet plan, amount and type of exercise, etc.
For me, personally, I noticed a change in stomach/hips/butt fairly quickly. I dropped pants sizes at a rather rapid pace. My face changed dramatically in the 10 pounds or so between 199 and 189. My bras are only now, after 50+ pounds lost, getting loose to the point where I know I need to resize.
"I want to be improbable, beautiful, and afraid
of nothing, as though I had wings." (Mary Oliver)