It's ok, but the lower legs could use a little work. I do quite like it though.
The head needs a lot of work, but other than that, I actually love him. I personally wouldn't change anything other than the head, and have to disagree with other complaints that people have had. I don't think the trans-orange stands out too much, and I think it makes a nice accenting color, alongside the yellow. I think the number of fingers works, /startrant BECAUSE IT'S AN ANIMAL. ANIMALS SOMETIMES HAVE WEIRD THINGS LIKE THIS. NOT EVERY MOC IS A HUMANOID, WITH HUMANOID PROPORTIONS. ANIMALS ARE NOT PEOPLE. DON'T EXPECT THEM TO LOOK LIKE SUCH.
Overall, I think they both work. Kayfer is an character, who I think has an interesting design, and Gradius pulls of the intelligent animal look quite well.