You know it is lichen and I know it's lichen, but it might be tough for someone to tell that without a rock or whatever formation this is growing on for comparison, so perhaps a Rock substitution for the blue sky would be more exciting. Maybe a little more depth of field would help. Nevertheless, you have an interesting subject and I like it overall.
Good textures, almost a landscape feel. Perhaps more about the colour than the texture, though. I find the composition a bit bothersome: there isn't a real subject here - the eye just wanders, but the inclusion of the sky makes it more than a rhythmically composed shot, drawing the eye toward the 'horizon' all the time.