Pretty good for a first go at it!!! The light on yuor grandson is not too bad. Maybe a wee bit underexposed or "under-developed" in software. The light on the background is not my favorite. I've encountered this quite often...what is going on is the flash in the background is raking upward on the quilted fabric; that is to say, the light is angling upwardly, and that accentuates the texture of the material, and gives a steep degree of fall-off. On a quilted fabric, that angled background light causes the quilted squares to show up very strongly. On seamless paper, if the light is angled upward like that, any wrinkles in the paper will show up very clearly. On muslin or canvas, anyt wrinkles or creases will show up. You get the idea!!!
Now, at times, showing the background texture CAN work, and work well. In this case, not so much, since it competes with the boy.
I've shot a lot of 4-light studio stuff before, and one tip to minimize background TEXTURE, is to try and keep the background light going "Straight AT" the background fabric or paper. Place the bkgd. light about mid-back behind the subject, and aimed "level", at the background. If you DO however, want an in-camera gradient like this, then you can place it low, and angled upward; as long as you make sure the bkgd. is WELL out of focus, then there will not be a problem with texture cues. Buuuut...if you have a wrinkled, tattered backdrop, angling the light at ANY steep angle across or down and across or up and across, will bring out textural clues. The human eye can "see" these clues very,very expertly and adroitly...it's part of what makes human vision so good at deciphering scenes.
Speedlight flash units have a pretty small flash "pattern" at close ranges. The orientation of the head, "wide" as opposed to "tall", will in part, control the way that a speedlight illuminates the background when working on a small- to normal-sized background. Output is also a big factor too; at short distances between the light and the background, even a few inches can make a 1- to 3-stop output difference!!!