My suggestion is to think about how your daughter will want it hung on the wall....and to try the tab look with 4 even spaced, 3 inch finish across it before you sew. Then if you pin them on, without any sewing, hang it on the wall, and see which you think will make it stand out.
What are you binding it with? I like tabs sometimes and sleeves at others it always depends on where it's going to hang and what the center picture is like. Your tinker bell is gorgeous.
I rather think I'd like the sleeve better on your beautiful work here, both for ease of hanging and because you could use one of the little seen colors to ribbon tie it to the dowel and hang it.
Have fun with it!
Sharon