Late to this collection, but I commend you on your alien designs. I find them outstanding, and quite original. To be blunt I find so many "monsterized" derivatives of a humanoid form to be a little tiring and uninspiring. So seeing something unique and truly new that isn't simply taking humanoid physiology and making it monster-like in some form or fashion, a breath of fresh air (pr in the case of some of your designs—hydrogen). Hopefully you have not abandoned your "Exobiotica" project, and will continue to work on it and post more as you go.
you have a awesome collection of alien drawings here, i hope to see more aliens, based on not just carbon, but silicon, sulfur, hydrogen, nitrogen and maybe all chemical elements of the periodic table.
What a wonderfully collection you have. I love your artistic style and the creativity shown in each of your creatures. So fun to read about each one! It is a beautifully gallery; keep up the excellent work and I will be looking for more from you in the future.