Hey man, good to see you on the 'hub too! That blue guy looks sweet, and the other monsters

Try some darker darks and lighter light in areas to really show volume in the forms, they're nice big shapes you have going and I think it could work really well.
Something to try out - I don't want to claim this is true for every case, but with a warm light, try some cool shadows, and with a saturated light try desaturated shadows, same vice versa as well. Really, what it is is varying your hues a bit more, in the monster pics for example, food for thought anyway^^ Keep it up!