Felt tip – worked well for stippling and could merge colours to give shading effects and to increase depth of tone. Can also hatch to blend colours and give impression of texture. The downside is that it is indelible so mistakes are hard to rectify.
Pastel – working from light to dark, can layer up pastel with hatching effect and it works well as a way to blend colours and give depth/shade/tone and also impression of texture. It isn’t easy to use pastel for very detailed accurate work or small scale stippling.
Fine liners – limited in that I only have a limited colour range, but as discovered before can be useful to add definition to a drawing where have largely used another medium such as coloured pencil or pastel.
