This is the first sketch. It was done with an HB pencil, nothing out of ordinary. Based on triangles, which were later turned into smooth lines of Tulips petals.
This is another step. I erased all the helping lines to make the sketch ready for shading.
This is the final phase. The tulip is ready.
Obviously, I could make the shading a bit smoother and a bit darker than it appears here, but I didn't.
As for the drawing challenge - this time there's actually a challenge in the lesson and it's simple and obvious. One should draw another tulip from another angle. So I chose this photo I found online.
This is the final, shaded result.
It's nice to know that this time it was way easier than last year.
I hope you enjoyed this lesson and found it useful.