Indeed you have a good experience that rekindled the artist in you because looking at the diagram you have just drawn, I must say that you are indeed a very good artist
I believe through this your ambitious and experience,.I must follow this same drawing procedure you have just done to also came out with a perfect resemblance of a diagram like this.
I must say you went to technical education and looking at your drawing of a crocodile, it seem just too perfect
Continue producing quality drawing like this as well for it also a form of multivation as well
Hope you will visit my post to drop a comment for it very important in this engagement