well, it kind of looks like your a beginner at welding. Thats cool, its good that your trying something new. However, i would practice a bit more on some scrap steel till you get a little better. Welding something like a bumper that might be used to pull something is ok if your a good welder. those welds don't look the greatest and i wouldnt trust them to do anything more than hold up the bumper.
Oh, and I'm no expert either but I'm practicing.