I like the emphasis you’ve placed on the major ridges in the paper. The cross contour lines on the reference image seem to be a bit more evenly spaced out than the ones on the drawing, however, so straightening those up a bit would be good.
Good use of cross contour lines and weighted line. Try to transition the weighted line more so that it gradually fades from Light to Dark to show an even transition.
I like the emphasis you’ve placed on the major ridges in the paper. The cross contour lines on the reference image seem to be a bit more evenly spaced out than the ones on the drawing, however, so straightening those up a bit would be good.
Good use of cross contour lines and weighted line. Try to transition the weighted line more so that it gradually fades from Light to Dark to show an even transition.