Anyone else spending more time, looking for pictures to draw then practicing drawing? Any insights? is there a Proko reference pack of images to practice line weights?

Learning to Sketch from Imagination

My attempts. The hand made me miserable🤣

Hi. Here is my third attempt at this project after watching the critique. I changed the rule and added only one value to the shadow. I did this because I wanted to emphasize the plane changes more. Any advice? 😊

I didn't understand the measurement part, can someone please explain it to me?

Una pregunta a los que saben. Me ha gustado la idea de usar un buen lápiz rojo borrable, pero en España es casi imposible conseguir el prismacolor col-erase. ¿Sabéis de algún buen lápiz rojo borrable para hacer los bocetos? Que se pueda conseguir en España y no sea muy caro, claro. Muchas gracias