Thanks for the comments. Yeah devamps are where I shine, I suppose.
EDIT: Fixed Fire starter

and grass starter
I'll give constructive critism to these for now. :D
'
Fire Starter'= I hope this isn't for a game? Why? There is nothing bad about it, but it is just a Eevee recoloured with fire on its head...:\ I would call it a 'Fire Type Eevee' myself but... Though it is a good retyping. ;) However, the tail shading is a bit messed up and it could be a bit more complicated; why don't you give it an actual fire mane? :D
Grass Starters: Again, you can tell where the other Pokemon parts are. I'll start with the first one. The Espeon (Yes, I recognise my favourite Pokemon anywhere. ;)) legs dont seem to fit. Maybe get bulbasaur or edit Grovyle's legs or something. :\ The Psychic type Pokemon legs dont really fit. :( The tail is pretty random as well. Why not have a leaf? :\
The second one is worse, sadly. The shading on it's chest (the really dark bit) is too dark, and towards the top it should be brighter. There are way to many dark outlines, and the sceptile head doesn't really fit with the theme of the sprites (it just seems to copy/pasteish. :\) The bulb on for its tail is also horrible placed. I love the grass thing on its body though. It really matches the theme of the sprite. ;)
Finally, the last one. The Rayquaza head and ear thing is a big
no! A dragon type does not fit in with a grass type. i recommend you sprite your own head, in a similar style to the Treeko evos (which is the style of heads you've been using for the past two sprites. There are too many black outlines, the leg closest to the left's anatomy is horrible (it goes quite thick to really skinny to quite thick again. O_o) and the bulb thing on its tail is pretty bad (no offence. :() Try and make it so it blends into each other (the green gradually changes into the bulb colour, instead of just placing it on top of a flat surface. It kinda ruins the Pokemon efect, and looks copy/pasteish.) Again, I like what you did with the grass, and how you placed it. :D Also, they are really good designs and look better than the Eevee, for what they are designed to be (starters) as the Eevee just looks like a retype, not a starter. After you fix these problems, I'm sure they'll look good. They are really good concepts, good job! ;)