Non-barista question: How high do you fill it up?

I order lattes and sometimes when I pick it up it just feels so light on the liquids. My picture is what my drink looked like after spooning off just the foam, and I haven’t sipped any liquid yet. Probably 1.75” of empty space from top of the cup to the drink, so there had been about 1.75” of foam. Do I need to adjust my expectations or how high would you expect the milk line to go up the cup on a latte?

NOTE 1: If it helps, I ordered a 16oz hot latte with skim milk.
NOTE 2: As you might guess, 1.75” of foam tastes like espresso flavored styrofoam. No creaminess.