Yes, the scale of our drawings is very important for defining how much texture we should focus on, a fish swinming on an ocean is an object, a wall made out of fish is a texture, in that same manner we want to focus on the imperfections on top of the surface we're drawing which allows for cast shadows to exist and thus for us to conmunicate that texture in our work.

In other words, we should only try to add texture, when the textural details are large enough to be perceived at the distance we are drawing the object from. If we are too far away, the details become so small that they will not matter for describing the shape anymore since we would not perceive them anyway, even if we looked at the actual object from the same distance?

This is not necessarily true, because since Drawabox is interested in helping you build your sense of spatial reasoning this means that for your work you'll need clear reference pictures which depict the forms in the structure you wish to draw clearly. This means that often your reference will be at a close enough range that texture can still be perceived - and it's still possible to capture texture in objects that are slightly further away and it can still be useful for the viewer, but we run into a certain problem when doing this for our work and that's the limitation of our medium coupled with the limitation of our reference picture. We are using for the most part an A4 page coupled with a 0.4-0.6 fineliner, this means that any detail that is smaller than this will be difficult to capture, which if your reference is zoomed out means most detail. The other problem we face is the limits of our reference picture, looking at an edelweiss from far away, similar to the one in your work will make it difficult to analyze the small cast shadows shapes because the picture itself might not give you enough information, be it because of the distance, or the quality of the picture.

So for the purposes of Drawabox, which is to develop your sense of spatial reasoning in cases such as this you have two options, the first consists of either choosing better reference pictures which are at a good enough range and a higher resolution which will allow you to see the cast shadow shapes more clearly, even from further away, or finding a different reference picture alongside your initial reference, one which more clearly depicts the texture and cast shadows present in the kind of structure that you want to draw - similarly to how you'd find a different reference in order to add edge detail and texture to your leaf structures back in the leaves exercise - or undergo texture, which is completely fine as texture is completely optional for this lesson.