There's never going to be as many Photographers in Scotland as there would be in England purely due to the larger population down in England.
That said, there's no reason why if you market yourself correctly, that you couldn't make a living from modelling in Scotland.
In my opinion, I'd say Glasgow would be better than Edinburgh, as it would be cheaper to live there.
As previous posters have said, there are good road and rail networks in Scotland......and great outdoor locations
Maybe you could do a few tours first - to dip your toe in the water so to speak.
Since I am not a professional photographer but have another job working with large companies I can tell you this:
In Scotland is only one thing plenty, and that are midges.
Followed by too much alcohol.
Work is nearly always bad paid, except you are a banker.
I do not know why you want to move, but if you want to boost yourself seriously ...
Why not going to the centre of everything (in Europe): Germany.
Everything is more plenty there than here, but also much more challenging and rewarding, (British laziness is not helpful).
If you are in Scotland and enter your car and drive ten hours you are ether in the worst northwest on a tiny single track road or about just passing London, what is both equal to nowhere, because still in the same tiny country with all its limitations ...
If you do that driving in Germany (based Cologne) you are in less time in all the big centers: Duesseldorf, Berlin, Munich, Hamburg, Brussels, Paris, Milano.
And there is the world class of modeling and opportunities.