I would suggest not trying to outline the 'objects' in the fabric at least right now. Try something really simple, like cursive lower case L's, or lower case e's. They are graceful, and usually look pretty good for everyone. Your stitch length looks really small. You can sew slower--you don't have to put the petal to the metal. Every class I have every taken has you make a quilt sandwich--use some of your muslin, or ugly fabric, and practice. After you practice, try your potholder, or placemat. When you start making mistakes stop. Walk around. Take a break. When you come back, try your practice piece for a bit then go back to your project. It is going to be frustrating. You will feel like it isn't looking like you are making progress, but you are! By the way, look at your tension on the back and the front. I've found you need to check it fairly often, it loves to give me trouble!