Technical Proposition on Faces:

For example, if you look at it outside of the work, the diagonal Line N.O. of the right p. in O. is diverted? Proceed as follows: Extend the space from O.P. (indicated outside the work) on the middle line of the oval from E to H. Let it descend vertically with its own length to point L. By taking a fixed line to B from there, angle Ě.B.L. equals the slope of the given angle N.O.P. Then draw through the cross-point E to point L, the diagonal I.Q. and continue accordingly with lines E.A. and E.C. as equal to E.L., as seen above at point F and below at point G: Thus, you have the shortened draw of the oval according to the fixed line guidance. Also, when you consider point L, explain how you draw from B to D through K, the arch of the horizontal facial line according to its slope. Note further that equally in this head slope scenario, the arch must be drawn downward so that the same in a backward sloping head should be drawn upward B.D. as bent, as you could see in the third example. It would align very well with all that we have noted here regarding the different positions and intersections of the face cross.

The second example nearby serves only to show that this rule is generally applicable to all cases in this gender of faces. For just as this slope differs from the first example, you doubtlessly see that the fixed line of this oval, going through points F.G.D.B., is much less shortened, and the arch of the face D.B.K.L. is not bent downwards as deeply as seen in the first design.

Translation Notes:

Gesigt-Linie: "Facial line" has been used for "Gesigt-Linie" to convey the idea of the basic line that frames or aligns with facial features.
Tronie-Kruys: "Face cross" has been translated to represent a method of measuring or aligning face parts.