Exercise : A drawing with textures

Following one from experimenting with drawing textures  I have done a still life drawing of different natural object with different textural qualities. Object here in include some pebbles, slate rock a snail's shell a weathered stick and a dead robin (found the previous day in the back garden).

Here I have mainly used charcoal, but have also used a fine pen,  a bamboo dip pen, pencil, a coloured pencil and a grey felt tip.