I hope that the following information is helpful.
Upload your picture as usual. In medium size.
When you read the Html of the picture you will see this:
WIDTH: 320px; CURSOR: hand; HEIGHT: 214px; TEXT-ALIGN: center" alt="" src="http://3.bp.blogspot.com/_bbCRFiRAtDA/Sa45DnLQ4dI/AAAAAAAACvc/54oeymMIkgw/s320/eieren+027.JPG" border="0"
Here it comes..
- WIDTH: 320px into 640px
- HEIGHT: 214px into 428px
and read a bit further change
- s320 in s640
That's all and ta daaaahh here it is; the picture a bigger size.
Another question was how did I make my writing space wider. I have template 'Scribe' and a long time ago I customized it. My son taught me a lot. Bonnie showed me how to make a nice background and I read a lot of information sites about blogging. Since that was a long time ago I have to go back and take a look to see what I did. I will find which site was very helpful for me and I will post the link to thsi site.
I hope to give you more information about this in a few days. Please just give me some time :-)