Challenge 1: Detailed Scales Without Planning Mesh Density in Advance — Solution Walkthrough

The answer:

Per this chapter's own material, Dyntopo (Dynamic Topology) solves
this directly. It automatically adds more geometry exactly where
detail is actually being sculpted, and removes it where the surface
stays simple, keeping mesh density proportional to how much detail a
given area genuinely needs — without requiring that density to be
planned out in advance.

Why this specifically fits the scale-detail scenario:

The student wants concentrated, fine detail in one small area without
manually subdividing that area beforehand. Dyntopo's own on-the-fly
density adjustment means sculpting directly in that area with a
detail-adding brush automatically generates the extra geometry needed
right there, leaving the rest of the model's own mesh density
untouched.

Why Multires wouldn't be the first choice for this specific need:

Multires builds a fixed stack of subdivision levels across the whole
mesh rather than adding density selectively to just one small,
localized area — Dyntopo's own localized, on-demand density increase
is the better match for detail concentrated in one specific region.

WHY THIS WORKS AS AN ANSWER
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This exercise checks that localized, unplanned detail is correctly
matched to Dyntopo's own dynamic, on-the-fly density behavior, rather
than Multires' own fixed, whole-mesh subdivision stack.