Seeing an Object Out of Nothing (?)
Playing With Strokes
Understanding Perspective Drawing
Materials
Composing a Subject
Techniques in Copying a Drawing
Composing a Subject
Natural Surroundings. Draw what you can see in your house. Find an angle that inspires you, say a vase on top of a vanity table or fruits on a tray.
Take Pictures. Capture the memorable landscape and scenery that you cannot keep in your imagination. Then from that you can have a good subject. See fig. below.

Sorry it was taken in one foggy, rainy morning.
Arrangement. When you arrange a subject for still life, try to overlap the objects so they appear well composed and solid. Do not attempt put a small gap. If you intend to put a gap, better make it farther. (See fig. below)

GOOD BAD
Focus. The subject must fall on these strategic points A,B,C,& D respectively to achieve good composition and emphasis. (See fig. below)

Imagination. Well, what can I say? If you draw using your imagination, you are on your own the key factor, however, is the next topic.
Observation. If one asks you to draw two trees at once in detail without looking at references, say molave and acacia, can you distinguish one from the other? Observe, observe and observe your environment.
Model. If you are drawing human figures by imagination, there is a great difference if there is an actual model posing in front of you. Copying set-ups or actual scenes will have less error than plainly imagining how it will look. When I attended an actual Nude Sketching session last year, there is a great impact on the expression of the drawing and the curves are much realistic than one imagines. So you can probably ask someone to pose for you, not necessarily nude
:)
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