This is my first critique so please treat it kindly
Im going to talk about the Technique more than anything else just to be clear. There are a few minor problems with the sizing of the lines, for example I think the whole of the lining may need to be a tad bit thicker (just a few sizes up. Only one or two, depending on the program,) except for the tail as the outline further to the right looks really huge compared to the lining on the left of the tail, that needs to be reduced.
The colours are perfect, The expression on pinkies face looks absolutely spot on, everything looks like it is in the right position, I am absolutely loving the cutie mark, It looks like a pose that could be from the show and of course it is indeed Pinkie Pie, and for your second vector this is really good.
All you need is to change the size of a few of the outlines and it should look perfect.
I hope I have rated this fairly and I hope you continue with vectors like these