Whoa, I really like your Minotaur, looks very great. I'm not better than you, but I think I still can give a few tips: The hand in the background has more contrast than the one in the foreground and both legs do have almost the same value contrast. Try to decrease contrast in the further behind limbs/body parts, because that gives a sense of depth. I would recommend watching FZD school's concept art videos on youtube, they're great!
hey man good start, i like your ideas and that you work in lots of different things, so far i got nothing to crit but if you put out more stuff i might pick up something i can tell you either way you must always be your own worst critic, always know when and where you fucked up and figure out why, and if possible Fix it, cant wait to see more stuff!
Great stuff so far, man! The only crits I have are to watch your perspective in certain pieces (the trees in your mech piece are throwing me off a bit) and bump up your contrast in your values a bit more than you have now. Great stuff, keep going!