Amaaaashiiing Moonie! You should kick your sister sometime again and force her to make some bishies (laughs evily).
Beautifully done, love the details and love the winter scene. Truly, winter with snow is one of the prettiest things to see in life in a season. The background blends nicely too. Seeing a Kobato wallpaper submitted brings me some nostalgia of when there were 472819 walls submitted of that series. Adorable and just plain lovely/romantic. I truly agree that it should be your favourite since it looks like one of your best aswell and is a definite favourite for me xD
I don't have much to say than that it is almost flawless. When there is snow and it is snowing, the sky is not blue, it is grey. Second thing is...the snow crystals. They are like blurry transparent dots, which is fine for the style but somewhere up front I sometimes literally see snowflakecrystals which are very out of place imo.
The text is nicely placed and nicely done. I do think the "I" is a little too thick/hard. Perhaps having taken a little more softer and fancy font would have worked better. The softness in this wall and romatic scene makes my heart go dokidoki XD. For the rest, pure love. Thankies Moony, you made my day :3 *snugglehugz her*