Goblin sketch

For the past couple of months I have been practising sketching, not quite every day, but fairly frequently. I have tried a number of mediums, but I am gravitating to simple pencil work, inked, or maybe using markers. At the moment I am simply copying/simplifying other artists' work, it's the easiest way to learn technique. This is a sketch of a goblin I am pretty pleased with. It's a goblin to