Loo roll has been in the news a lot recently so it might be appropriate to record history by drawing some!
This is an excellent exercise for looking at value, the term for a scale of light to dark. High value is light and low value is dark. You really need a very wide range of tones to create shadow and light…this loo roll is a very light colour but you will still find some of the shadow and the inside of the cardboard tube are very dark. Practise doing ellipses which is the name for how you see a round shape from an angle, it's important to measure the width by the height of it. To get the loo roll to look right you also need to compare its height and width. Drawing is about constantly comparing lengths and angles.
The soft paper of a loo roll falls like material so it's very good practice. The tone on fabric sometimes goes from light to dark very gradually and other times has very strong edges. As a piece of material curves it often gets lighter, then darker then lighter again several times as light is reflected onto it.
You need to compare the tones very carefully.