I can't possibly rate anything. I don't think I can come up with a number to represent the quality any piece of art xD
However, I did spot some major anatomical problems with your red thing. So I redlined it (in green xD)
First of all, the back's kinda lumpy, so yeah; make sure it looks smooth (not all the time, some poses require the back to be lumpy, but not this one xD).
Second of all, the butt hangs out way after the legs have finished. The tail also doesn't really connect with the body much (I like to think the tail is an 'extension' of the spinal cord). And there are these really pointy things jutting out of the butt, reminds me of a cattle ;D
Another thing I spotted was the head. The head's a sort of irregular 'rhombus' shape. A head's general shape should be symmetical
The thing I'm bugged with in the second picture was that the lineart was a brighter colour than the colours. I don't like seeing that, looks cheap in my opinion (purely my opinion, maybe someone could pull off a light-lineart-non-cheap-looking pic? I dunno).
With both of them, I found that the highlights weren't sharp enough. It also looks like you used the dodge tool; a load of people use that tool but I wouldn't say I'm a fan of it. I mean it's an excellent tool, but I just prefer picking a shade myself and brushing it on D8
Also one singular enormous, big mistake you've made. You've saved them in JPEG! JPEG is only for photographs, and it looks like you've tweaked to quality a tad too much. Save as PNG next time 'kay?