Well, there's many things to improve here, but for your first sprite, it's not too bad. Do remember that spriting can be tedious and at times quite difficult, since you need to draw four sides of the character times three. That's something that takes time. It's hard work to become a decent spriter.
I'll point out a few things to help you get off the ground with your sprites. Just remember that the only thing that can
really make you better is practice, practice, practice!
Ok so, first of all it doesn't really look like you were going for a specific look, it looks more like you just improvised the outfit (I noticed that it looks like she's wearing a bra on top of her shirt?). I think it would help to have a clear goal in mind and trying to sprite characters that you can reference from (as in colour choice, hairstyle, clothing and details). Maybe try spriting a character who already has a portrait or a faceset, and see how much you can make it resemble the original. Note that with pixels, there are many details you have to leave out due to the limited space, such as freckles as you mentioned.
Now then, onto the more technical aspects...
Colours. One thing that I think is really important, is colour choices. This is one of the reasons that I think it's a good idea to have a reference if you're just starting out. Your colours here are way too saturated, and frankly... Just a really bad choice of colours. I can't tell you how many "first sprite"s I've seen with brown hair, a red shirt and blue jeans. For some reason it seems to be the main colour choice for new spriters.
Choosing the right colours is important to give your character personality, and to make it pleasing to the eye. If you really want to improvise your sprite's clothing, take a look at some pictures of actual people first. What do people
really wear, and what colours?
Technique. Here I'm talking about two things: The shading, and the pixelling. For now, there isn't much you can do about your pixel placement, because it's one of those things that you just have to keep practicing in order to get better. There are a few tutorials out there that can help you get on the right track, but the rest is up to you.
So about the shading... Shading can be really difficult to do for new spriters, and experienced ones aswell. Most sprites use front lighting, which means that the "light" is coming from the front of the sprite, and is distributed evenly on both sides of the sprite, as you can see on the nude template. I could keep talking about the complications of shading forever, but I'm afraid that wouldn't really help you at all. If you want to learn more about shading, check out some tutorials, they can be really helpful as long as you don't take their word as law. Everyone has their own style of pixelling, and their own preferences.
Sorry for the wall of text haha, I hope you're alright with me telling you these things. Here's a few tutorials and guides that may help you out in the future:
http://rpg-maker-artists.deviantart.com/art/Pixel-Art-Tutorial-4-3-4-cylinders-and-cuboids-329318036 - Lighting/shading.
http://rpg-maker-artists.deviantart.com/art/rpg-sprite-tutorial-152649865 - A good overall look at the making of a sprite with nice colours and proper shading.
http://rpg-maker-artists.deviantart.com/art/Pixel-art-tutorial-by-me-332907642 - A small guide that shows a few different techniques and tips.
I suggest you search for some tutorials on your own if there's anything you're in doubt about. Other than that all I can say is, good luck! Remember that practice may be tedious, but it pays off in the end! I'm sure if you keep it up, you'll improve a lot in no time!
I hope I didn't come off as too harsh or rude, that was not my intention! I also hope that this wasn't too confusing. English is afterall not my main language, haha.
Have a nice day!
