I can see how Lavapho looks like a spliced orange Oshawott/Dewott. Nothing wrong with that at all. They're neat pokemon and yours is equally cool. They just have similar features. Specifucally, Lavapho looks to have Oshawott's size and shape with some of Dewott's face, that's all.
In the end, it's still your creation and you'll see it how you see it. Others who play your game will see it how they'll see it. Yours are original and are excellent in their own way and no one is accusing you of unoriginality. :D Keep up the great work, Ęℓαчиıı.