Wahey! Macro photography, I love macro photography, they're so nice :3
I shall try to comment properly on all of them despite my poor poor ability to photograph
Firstly, what camera do you use? If you have a relatively good digital camera, or if you're shopping for a nice digi cam, then I would recomment those you can press the shutter button half way, those help focus on the object you're trying to photograph :3 Even if you think you don't have a nice camera, it's how you use it that can express a nice photo :3 (no, I have no idea what I'm talking about either
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Window
The white and the shades are pretty much ok, the angle taken is pretty good too! There's just something in this picture that doesn't seem right, do you think? I suggest you put the window next to something, or include a wider part in the picture. Even if it's just majority of the window and some wall, it's fine, that way you can tell that it's clearly a window and contrasts of colour would be greater.
White Tree
Well captured! I love this portrait picture! the focus is pretty good and the tree stands out as the centre of attention. The angle is pretty good too, the road behind it makes the picture look good, i have no idea why, but I like it :3
Steps
Close photography! Wheee! first decide what you're going to focus on, then focus and then take the picture. Here I suppose you're focusing on the steps; similar to the window, I suggest having something else next to it like perhaps the bigger part of a land, or wall or anything. The rail would do too. Make sure the picture is clear as you can see there are some fuzzy bits.
Sky
I adore this picture, the nice and white fluffy clouds! This picture is wonderful, you included part of trees and houses and make the wide sky stand out, very nice :3 One little thing, try involving a whole house or some land. If that doesn't look nice then try something else, experiment until you get a satisfactory photo.
Pink tree
Oooh good picture! I like the way the colour contrasts, very well done
The effect of falling petals are great too even though it's not intentional.
Pine
Macro photography! I adore
this is a nice bit you've picked, but it's fuzzy! >_< I would suggest you focus on one small bit of the pine, perhaps the middle, the bit you want to stand out most and take the picture. Hopefully there would be depth of field so other than the focused bit, the other bits would be blurry or slightly fuzzed. That can make the focused bit stand out more.
Leaf
*is getting tired*
-look at comment for "Pine"-
Blue sky
I love this photo. So simple yet so beautiful. I don't know what to say >.<
Oooh and lastly try photographing at different angles, it gives you different effects and proportion of the object.