alright, here's for some feedback:
overall this picture seems a little unfinished due to lack of elements. the main and only character is placed in the center, drawing your attention towards him/her. this is the next thing i want to point out: although the figure looks quite nice (almost as if it was taken from some kind of game or something) i'm having a hard time figuring out whether this is a male or female character. i guess it's female since the hair looks pretty feminine.
something really important i want to address is the choice of color: sadly the sky has almost the same color as the figure's hair, making it really hard to distinguish one from another (maybe a better contrast in colors would make it easier to understand whether this is a guy or a girl). also the person wears green-ish clothes which is another main color in the picture (because of the grass). maybe you should have taken colors which don't blend too much.
as for the lonely cloud: it kind of steals the attention. i guess it's supposed to be part of the overall background but in the end there are almost no background elements which make the few existing ones more important.
so, in the end there is to say:
this doesn't look like too much, but i can see potential. the figure looks nice but i think you should have taken more time on the surroundings as well.
if you are interested in doing more works of this kind i can recommend you to visit deviantart.com, a website which provides great resources and has many different artists who you can learn from!