If you use FreeOnes to upload images, it downsizes them to a maximum of 758 pixels on the longest length; whether it is height (portrait) or width (landscape). Whilst you can drag it out so that it appears bigger, it will actually make the image look worse than it does already because you are making a lo-res image bigger rather than resizing the original image. It's already been compressed by the time you've uploaded it to FreeOnes.
So, in order to continue doing what you were doing
@Slowhand69; you will simply need to use a different image host. When you insert the auto-generated forum code it gives you to post the image; it will appear at the maximum dimensions that can fit on the page embedded within the forum; and anyone can see it at it's absolute largest size by clicking the link to it.
BTW, Abload states that you cannot upload porn in it's terms of use. So as long as you make a wise choice with your next host; then you shouldn't have the problem of having images removed later down the line. There's not a lot that can be done about that now.