oil

Olive Olea europaea botanical watercolour illustration illustrated for the Global Crop Diversity Trust by illustrator Lizzie Harper

With stem detail showing swollen red bases of stem hairs

Blue whale Balaenoptera musculus illustration from A Life on Our Planet by David Attenborough

Olive Olea europea sprig with leaves fruit and detail of one half olive

Old Olive Olea europaea tree showing typical gnarled growth

Eucalyptus flowers, fruit and leaves on a branch

Eucalyptus tree showing typical form and growth habit

Sweet orange Citrus sinensis in bloom with single flower in detail.

Sketchbook study of a red Bee balm, or Wild bergamot; focusing on the flowers.

Sunflower Helianthus annuus close up of one flwoer

Sneezewort Achillea ptarmica plant

Rosemary Rosmarinus officinalis sprig

Parsley Petroselinum crispum sprig and sprig with bud

Oil seed rape flower Brassica napus flowering spike in stippled pen and ink with watercolour top wash