My potatoes

[JyonnyNovice]

Hey man, for a quick and straightforward way to give depth to this kind of illustration you could try cell shading - basically just choose a bluey colour on a layer set to multiply and paint on the shadows (can knock the opacity of the layer down to get the desired look), leaving hard edges is fine don't need to sculpt it too much, then for highlights set another new layer to colour dodge and paint the highlights sampling the colour underneath (i.e. highlights on the trousers, sample the red colour, on the jacket sample the brown colour etc.) It's a nice and simple approach with just three colours for each part.