How do I post bigger pictures ?

You can go to Picasa and make a free account. Upload photos to the album, then open the album, on the left it will say "Link to this Album" - click that, then below it, it will give html code. If you want to link to a picture, click on the picture, then on the right you will see "link to this photo", click that it will give you the option to direct link so that the pic is in the message and you can pick the size like this:

thumbnail:

or medium:
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As for the rose, you might check to see if there are more then 1 rose in the pot. At my supermarket, they've been known to mix them.

Is it still in the pot? It could probably use a larger pot, sun and some rose food.

Could this be the Disneyland rose offered by Jackson and Perkins? Is the rose in the original pot? That would keep the rose smaller then its mature size. You may be able to save this rose with the proper care