Your map looks fine, and considering you want control to edit it in the future, I think you should have some faith in your own skills. To make it look more like the map you linked you'll just need to tint the mountains layer with something other than black. So a layer mask over that layer set to screen or overlay, and then a layer over everything with a parchment paper set to overlay. Like we can give you some advice here for you to get what you've made the rest of the way. You're more than halfway there. This map is better than 99% of client sketches I've ever seen.
If you're positive you want to commission art, I mean yeah, some of us would help.
I don't do commissions where I provide the full layers. For 1, it's impossible, there is not a single Photoshop file that would make any sense. I use multiple programs and you would need all of those programs with assets set up in the correct folders, some of which are purchased stock items that you don't have the licence to use but I do. I would have to make a map very specifically special for you to make it editable for you in a way that made sense for you. Unlike Kell I'm not worried about my 'technique being stolen', I am more than happy to explain how I got to any results here on the forum for the world to know. It's just impossible for me to legally provide a means to manipulate my work in a meaningful fashion when I've spent decades building up a bank of paid stock art and the license is for me. No one wants to dump an additional $50 on stock art packs to be allowed to own the layers, and my layers tend to be made up of like a sandwich of 50 different textures with work from dozens of sources from multiple stock art sources so it would be an enormous pain. That's why I will only provide text and city point of interest icons as an editable or png option, everything else gets merged.
Certainly I can plan for text to be editable, and I can also make all city/location markers editable, but all the rest of it gets merged. I also do future edits to text and points of interest that need adding or removing due to in world events, for modest fees lower than the creation of a new map.
But yeah, there are several people in this business who have made the agreement you want only to find their work slightly changed being sold or presented as someone else's portfolio piece. So, while you feel uncomfortable having fixed art, we have discomfort not knowing what's happening to our art. Even without giving layers our art gets stolen. Most of us have dealt with it and will continue to throughout our careers as a consequence of having our art on the internet.
If you want to be able to edit your art... and you feel uncomfortable not being able to edit your art... I really think you should keep pushing your own creation forward. You've gotten so close to finishing it.
You just need to add lakes (your rivers look fine), location points of interest, text, a fancy frame, a ribbon or cartouche, a compass, and most importantly, some texture sandwiching. For the borders of the countries, draw them with an airbrush or marker, or do vector lines if you want them to look flawless, or set the blend mode to overlay.
Switch out the mountains you scaled up for mountains that are already that large, or make a new mountain by stacking a few and erasing the right places if none of the pieces in the brush set are large enough by default to fix the pixelation on it.
When you do the text, give it an outline stroke in the color of the base canvas.
And that'll do it. Honestly I feel very confident you can finish this map and maintain editability to your standards with what I see here. The river looks really good and so does the shoreline. If you don't want to make your own compass, frame or ribbons all of those can be found in the assets section here or on other stock art sites too. Here's a free ribbon you could use. https://pixabay.com/vectors/banner-r...anner-3284786/
And I made this free compass for a challenge you could use if you wanted.
Hunter's Wish Tiffany Munro feedthemultiverse slice8.pngHunter's Wish Tiffany Munro feedthemultiverse slice11.png
And you can do a basic frame by doing the same echo-stroke you did for the shoreline, except around the edge of the frame. Make a blank layer, select all, shrink the selection and do a stroke on that. Do that a few times and get creative with the fill and clipping things to the fill.
That's really all it'll take to finish it. The only thing that looks off to me is the pixelated mountain and the way you did the country borders. Like the coast and the effect in the water around it looks great, the fill isn't too cluttered so it's easy to read, and your river has good energy. You should make a WIP thread and ask any questions and we'll get you through it that way!