Sketch It Out
Pen and pencil drawings of flowers usually work well especially when drawn cleanly and smoothly. However, they also work pretty well when they are drawn in a much relaxed manner. Try to exaggerate the weight of the lines you would be using. Do not be afraid to lighten the pressure or make it heavier. You can add loose or even scribbled marks. This would suggest foliage and overlapping petals.
Draw Something In Between
If you’ll be sketching with line, it’s good to try drawing shadows underneath your petals, instead of outlining each petal precisely. You can place short, stippled marks. These can suggest stamens placed at the bloom’s center. If you’ll be observing different drawings, you’ll see that petal length and sizes vary greatly. This is very evident especially if the flower has a certain angle to its viewer.
Get A Light Source
You should also have one light source for your drawing. This is important so that you can determine the shadows and the lighter portions of your picture. This gives your drawing depth and a much realistic look to it.
Improve With Variety
If you want to improve with your drawing skills, you can do so through variety. Try to vary the position of your subject or model. Try sketching it at different angles. You should also try different light sources. Doing this would definitely improve your skill.