Hi Faith and welcome!
I think you site has alot of potential and is user friendly.
I would make a couple of suggestions though, just trying to be helpful

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The drop down menu on the Art for Sale Page is a good idea, but it doesn't allow for a client/purchaser to enter which piece of art they are wanting to purchase. Even if your art is all priced the same, maybe you could put some text in explaining that. And then...
I think instead of scanned image numbered files on your Art Gallery, you should title all of your different pieces and then rename all of your image files appropriately. You would also want to describe your art via original or prints size, surface, medium to allow the purchaser to know what they are getting. That way the purchaser can identify which piece they are wanting to purchase.
I'm not sure what the donate button is for? Is this to donate to you? Or some organization? If to you...not sure how that will be received as per professionalism. If for some charity organization, then you would need to explain that.
These are just suggestions and I want to wish you the very best on your artistic journey!
