A vagabond's sketchbook

[Madzia]

Im having issues as to how to continue renderring this up.Maybe introduce a second light source ?Like something cold like aqua blue ?still a noob in colors.And not sure how to introduce texture brushes without it looking like shit. :I

You don't need to introduce second light source you need to first of all know about environment thus reflected light. I've picked colors in shadow and they have almost 100% saturation red/orange hue. But you have gray/cool background and it will affect the shadows. They will not be so saturated. Think where he's standing right now? If in daylight outdoors then sunlight is yellow but blue sky work as filling light tinting shadows with blue color. I hope it's understandable :D
Your designs are great, just read something about colors they are so complicated but already many artists explained in details how they works :D Good luck!