The Gangster

i had this weird idea for a character pop into my head, so I drew him the best I could. The textures are nice, but I can't quite get the shadows and highlights to work. 

Textures used:
atomicbrownie.deviantart.com/a…
henrideacon.deviantart.com/art…
goodtextures.deviantart.com/ar…
pikkatze.deviantart.com/art/Fi…