Getting ready for a print to canvas

So I am getting ready for my second kid to be born in a couple of months and wifey wants something to hang on the wall. It is going to be a boy and his sheets have a train theme. Wifey was going to paint the trains on a few canvases, but I thought, what a great way to learn to use Photoshop. Well, I did just that. I took a picture of the sheets, Took it onto PS cut it out, played with a few layers. Took me days what some of you would do in minutes, but it is done..... I think.

I thought that I would post it in here and see what some of you think. This is going to get printed on a 9"x27" canvas, so I have no idea what needs to be done to make sure it is ready for that. ANy suggestions that anyone might have I would appreciate it. Just take a look and let me know what you think. Thanks.

Just make sure it has enough pixels (150ppi is plenty for canvas) really. Save it as an sRgb jpeg, send to a good canvas firm, done.

Sorry I didnt get back to you sooner. Thanks for the tips. I ordered it the other day. We will see how it comes out.