Hello Paula..........(from Sydney)......it's late in US, but someone will be along. In the meantime..........Frankly, your 'charge' is entirely up to you, of course..........now you can 'default' price everything by entering your default prices at the Default page, Behind The Scenes.........I go up in price
by $5 smaller size,and more after 12x14 +/-
There's lots more you can 'do' now, yes.............let us know any issues. Check others' prices for a guide as to the same genre Art - horses,etc.
Also, made a decision now whether you want to Watermark.....and it will appear in future uploads,too........
Also, decide what Social links you want.....ie .. uploads to your f/b fan page,etc...........just ask