This is my whale concept… I hope I get some critique and advice thanks
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It’s a great start, and interesting concept…
I think maybe back up a bit and consider details and how they need to play into the overall form of the animal. The channels on a whales belly for instance are present in your concept illustrations but not on the extended model. Perhaps add that texture down the bottom of the body.
Consider getting rid of the teeth you have now and creating a separate tool for your teeth on top and bottom as well as add detail in the mouth by giving it an esophagus/throat entry and gums.
From your concepts it appears he wouldn’t rise that far from the water, and given that he is likely at least partially an invertebrate, give thought to the idea that it may function more like your drawing, skimming the top of the water with it’s mouth open instead of rising up as far.
Also think about your textures. Your concept is rooted squarely in reality with the shapes and animals you are using so play off of their colors and textures in real life. Look at the details of where their limbs meet their bodies and the textures and color variations at those points. Apply similar concepts to your animal. This could also play into the fact that it is blind… perhaps there would be color variation as well as texturing where the eyes would have been long ago in the evolution of the animal.
Possibly give some thought to creating some dynamic by scaling the fins over the length of the body or having a few sets that are larger and the rest smaller. It seems unlikely it would fit into it’s shell with that much extra mass in the form of limbs.
It’s a REALLY cool idea for a see monster and I hope you continue with it. It’s a great starts I just think you got excited and maybe went too far too quick.
Hope that’s helpful and taken the right way!
Keep up the great work!
Cheers,
holto
Wow… this is really great help. thanks man… I will improve it…much more. I hope I adjust it properly before I learn how to render well … but this is GREAT critique.
Back to do more research.
Glad I could help.
I look forward to seeing where you go with it!
Cheers
well it does has the detail but it’s not realistic… but use other tool for teeth is better Idea. i just gonna post this so u can see and could advice more. 
I don’t think that fisherman wants to reel that in! I love the teeth and the sae-dragon like body with the multiple flippers!
Thx man. i was thinking that he can make whirlpool by sucking water underwater but gonna be too much. haha