Use a color swap for the line work to add contrast or simply color the lines with a marker or paint pen (I find a Sharpie works well).
The frame that allows the picture to hang on a wall or stand on a desk / shelf. Just snap the picture in.
Recommendation: A thin version at 2mm total thickness is included to reduce material and print time. This also avoids infill becoming visible if the drawing is back-lit.
Important: Be sure to allow the print to fully cool before removing from the build plate to avoid warping it while still warm.
If you are having trouble printing thin lines or the slicer preview is missing lines, try the Arachne perimeter generator in PrusaSlicer 2.5 or later.