I can see you like to draw and some of your pieces like this are done fairly, but I wish you'd make the lineart cleaner and put in a bg other than white. And try coloring using layers, that way you can block in all one solid color then come back and highlight and shade. Do try that next time.

As for where you put the highlight on the tentacles, it makes the lightsource confusing. pick oe point (left/right) then put the highlights on that area, things will be moe cohesive. Shading a well

Now there is one from the imagination! quirky no doubt....