for more complicated objects, so that you can improve and gain confidence.
start by reducing the difficult shapes into more simple ones: circles,
ellipses. Look carefully at the inclination of the curves. And measure
with a pencil or brush extending your arm with your elbow firm and
closing one eye. Rest your thumb where the distance ends and transfer
it to the paper.
Relate some measurements with
others so that the object does not get disproportionate.