So here is my perspective template as requested. Just open the psd file and drop into your painting . I usually keep all my perspective layers in a group/folder so I can turn em all on and off when needed. If it doesn't fit then just free transform , should be pretty straight forward
my teacher at CDA Jackson Sze taught me how to do this btw , so I credit him. I encourage yall to do it yourself and save the file , that way you will always have it.