did you use the attribution to center the image? you could also use
this codes that will shrink the image at your desired dimensions:
<img src="
http://url of your image.jpeg" width="#" height="#"/> works
as simple html no widgets needed if the result is an image align to
the left, you could use the <centre> tags (</center>) or align it with
div : <div align="center"><img src="
http://url of your image.jpeg"
width="#" height="#"/></div>
I do recomand using a smaller image, because the shrinking process can
distort pixels (image quality), some platforms after using shrink
process from an gif (animated image) results an gif static image (same
image extension but not animated)