These are adorable pony designs. The colour schemes are interesting and vary from the default schemes commonly used by adopts artists. The designs are a little bit more cookie-cutter, but number one is absolutely adorable. For future reference, I would try and get rid of the little white spaces between the lineart and the colour, and on humber three it is quite evident. I think that you could have maybe added a bit more to the design of numbers two and four. Maybe some thin lines of colour on number two, or perhaps some tiger stripes on number four. All in all, these are adorable adopts, and your work shows great promise.