What is it that you feel looks "rough"? It looks good to me. Perfection doesn't happen overnight & no way did my first attempts at FMQ look anywhere close to that good. Plus, feather motifs are an intermediate pattern so you started out with a pretty big challenge.
The one thing I would definitely recommend if you aren't already doing it is to be sure to SID before you start. For SID, I use a 50wt/2-ply thread by Aurifil in a matching color (or if I plan to quilt a design over the seams, I use YLI water soluble thread). Having SID/foundation quilting will give you a smooth, straight "palette" to work on for your FMQ. It will reduce shifting & also better secure the seams. That & marking my quilts made the biggest difference in my FMQ after I got my DIY sewing table so my machine sits flush with table top. If you quilt on a DSM, there are a few inexpensive tips I found helped before I made bigger investments:
1) I built up area around sewing machine using slick chocolate boxes & waxed paper-covered shirt boxes that I taped to each other & my machine bed with masking tape. Having even an extra 18-24" level with your machine to left & behind will make a difference. And yes, I personally made the sacrifice of eating all those chocolates -- anything to improve my quilting.
2) Buy Machinger's gloves or cut fingers off of grippy kitchen gloves or use 4-6 "Secretaries' Fingers" to help you get a grip on your quilt.
3) Change your needle every 8 hours of quilting or as soon as you notice a popping sound or crooked stitches. For Aurifil 50wt, I like Microtex needles in size 70/10 or 80/12. I've also used Quilting needles and those are great with poly and poly/cotton blend battings, but I've found that Microtex tends to work best for me with 100% cotton battings -- but try them both & see what works for you (some people prefer a Topstitch needle w/ large eye).
4) To best hide stitches that are slightly uneven lengths, choose a cotton batting. The crinkly look that cotton gets after a trip through the cold gentle washer/low heat dryer will hide that pretty well if you use a matching 50wt cotton thread (Aurifil is really amazing, but Gutermann 100% cotton is also decent -- just more linty).
And the most important tip of all -- cut yourself some slack! Quilting, like any skill, takes time to master. Enjoy the process of learning & all your beautiful creations along the way! We learn from all those mistakes so unless it's a competition quilt or there is some issue with stitch formation, I leave the stitches in & just keep on quilting. This quilt is better than your last one & the next will be better than this one. Each quilt tells a story about your journey toward mastery of FMQ and some day you'll be able to look back with fondness at these quilts and how they brought you to that point.
