How to draw a girl by the sea
Reference by Alina

Sketch the pose
Lightly outline the head and long hair together. Draw a curved line down the back, with lines across the shoulders and hips. Sketch the arm and body sides.
Draw the outline
Go over the hair, the sweater with its sleeve and hem, the hand and the sides of the skirt. Keep the light lines.
Shape the sleeve and skirt
Lightly mark the round shoulder and the sleeve, the skirt's waistband and a few long lines for its folds. Keep the hair as one shape.
Add hair strands and folds
Draw long strands in the hair and a few loose ones to the side. Add folds in the sweater, lines on the cuff, pleats in the skirt and the fingers.
Clean up and draw the sea
Erase the light lines. Draw a straight horizon at shoulder height, rows of waves with foamy tops and the edge of the sand.
Colour the hair first
Fill the hair dark brown-black; the rest stays pencil.
Colour everything else evenly
No shading yet: cream sweater, navy skirt, a light skin tone on the hand, blue sky, dark blue sea, white foam and sandy beach.
Add light and shadows
Add grey shadows in the sweater folds and lighter streaks in the hair and skirt. Darken the sea between the waves so the white foam stands out.