Originals in this selection, Drawing.
Line meets wash
Ink, pencil, watercolor and pen meet on the same sheet in a mixed media drawing. You can look for mixed media drawings for sale when you like the directness of a line but still want color and area.
A pen line stays hard, a watercolor over it bleeds soft: that tension is the charm of the technique. Pencil often sits under the color and shows through, ink can stand on top. The paper has to take some punishment, so sturdy sheets are the norm.
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Paper, mat, light
Works on paper belong behind glass with an acid-free mat so the sheet does not discolor. Keep it out of direct sun, since inks and watercolors fade. A good listing names the paper type and sheet size. Related worlds are graphic and illustrative work and surreal drawings.
Choosing by material
Which tools are involved is often stated in the listing: ink, watercolor, pencil or pen and ink. Then there is the sheet itself, paper in various weights. The price band under 500 euro is a good start.