I use Gimp which has a big learning curve but I would fix the problem by isolating the text and the flowers into three layers. Then I would scale the wood up vertically so that each board looks wider. Then put back the text and the flowers. I might rescale the flowers both horizontally and vertically. In gimp there is a little button which, once you click it, proportionally scales images vertically and horizontally. Have a look in your graphics progam for the ability to scale vertically and horizontally, proportionally, first, before touching anything. Also, your banner boards arn't horizontal.
