Phyllis,
Yes, looks like its fine up to your largest size, 42" x 60".
2 things. You have a price of $278 on the 40 x 60 and seems you might be leaving a couple of hundred dollars on the table. Mine is $457 or so. Secondly, on my monitor, image seems a bit green/yellow, feathers not really gray to me. And the blue water seems a bit off-color too. Can easly check if you have some "eyedropper" thingie and check the grays on the feathers and if good, should be about equal numbers, but if one is much higher, then the color might be off, unless you painted it to have that cast/tint.....
Nice image, as always.....
Rich