Hi! I used photobash in some of them for example some reptile scales. But usually I'm drawing all of them by hand like in Antipodean Opaleye - u can find lineart on my artstation.
I admit, you art is really astounding. I am definitely looking forward of what you will create.
And of course, incredible dragons you draw there. Congratulation, I personally would LOVE draw them as detailed as you do!!