I think these need a bit of work. Seeing as they're somewhat similar, I'll just go over them together.
Firstly, never save images as JPG. Save them as PNG to prevent the loss of quality. Secondly, I think the choice of font is quite poor. I don't usually use script fonts like that, since they usually end up breaking a banner rather than making it look better, except in some cases. In this case, I think the script font is a no no, since it's hard to read and it doesn't go with the rest of the banner.
I am guessing you used Paint for these banners, no? Since the whites in the eyes of the Pidgey are gone, I kind of assumed that. If not, then sorry.
I don't really know what else to suggest since I don't know what program you used. What program do you use to make these? I think I can help out more if I knew.