The very first thing that caught my attention about this piece is your remarkable attention to variety of texture and beautiful mark-making. Your technique is exquisite, and the concept behind this piece is not only clear, but (successfully) edgy and thought-provoking. Religion and religious symbols are great subjects to explore, and I don't see it done this nicely very often on this site. As far as any tips go, I might suggest that you soften up some of the lines around his face the big mutation connecting his mouth to the hat, as it gives it a sort of outline quality that doesn't seem to fit the rest of it.
My favourite thing about this drawing is that the more I look at it, the more little things I admire, such as the subtle faces and appendages from other creatures I see crawling all around him. I gotta say it's pieces like this that remind me why I want to be an illustrator. B) Excellent job man