Go for it. I've been to a local quilt show and there are quilts of all ranges of skills on display. Since your quilts are original - or will be once they leave your sketch book and become a reality - you need to show off you ability. As far as entering them to be judged, just stand by one of them at the show and you will get a good idea of what people think. Judges go for perfection but the public go for style, color and originality, I think.