Hi
@mcouden
First of all, I am not an art critic and can only let you know that it looks great to me from an artistic standpoint.
I understand one being nervous about putting something out on the internet to sell yet sometimes you have to just give it a go and see what happens and adjust over time for what you offer on Etsy.
That's how most companies make their products btw.
I am assuming (which may be a bad assumtion) that you final product is a print that you ship to a customer. If a print is your final product, it is always best to make a trail print and see how it looks in print form. What you can see on your screen could very well look different in print. Not all printers can reproduce all the colors one sees on your monitor.
What some companies do is get marketing feedback (sort of what your are doing) yet marketing checks in with their potential customers e.g. people that would potentially buy your product.
The other thing you can do is see what other similar vendors are offering (though that does not say it their product is selling either though).
I am pretty sure that most buyers are not looking at how sharp the image appears for the type of painting your are creating. Probably more when they look at your picture is how if feels to them for the place they want to hang your picture.
So here are another couple pieces of advice.
View your image on your screen so that the actual size of a print would fit your screen. For the average viewing it would be unusual for them to look at an image of your size close than 12 inches away. At 12 inches away, 300 ppi is more than sufficient that your sharpness is not limited by pixel count. In the total screen shot below, my Mac laptop screen (16 inch) is 8.5 inches high and abotu 12.5 inches wide. So I turned on the ruler with Cmd+R on a Mac or Cntl+R on a PC, set the inches (right click on ruler an choose inches), and adjusted the zoom level until the 10 inch mark on the photoshop match about 10 inches of my actual physical screen and then just viewed from a foot away. No issues of image quality were identified by me.
Another approach would be to make some simple adjustments such as saturation, contrast, brightness in photoshop and see if "you" like your image any better. Just keep in mind it is what your customer like to see is what sells.
If you need any specific advice on using Photoshop certainly ask away, there are lots of forum members more than willing to help.
Hope this helps some and best wishes for your endeaver. Below is that screen shot as an example of what I was viewing on my full laptop screen.
John Wheeler
