You might even need to lengthen the right strap with a shoelace (First thing Les taught me, and have done it on all my accordions) you seem to have it quite high up, which often happens with the little ones as the straps are usually quite short, might be much more comfortable a bit looser and lower down, and yeah, a bit to the left so the keyboard is more central. Apparently the black keys should be in line with your chin
That particular rule I find difficult to stick to with larger accordions though, and have to compromise a little to account for weight, but that should be more comfortable and free up your right arm significantly.
Pay attention to your shoulders too, you don't want to be having to tense them up to play or to support it, the box should just sit comfortably in the right position. Always keep adjusting till it feels just right
Nag, nag. sorry! :lol: :tup: