EDIT: I will try to boost it up to at least 3000 buzz eventually. Hopefully.
Just had the idea that I need this exact man to have some time on a relaxing resort. He deserves it. So...
Yep, would definitely need a picture of Alastor in a Hawaiian shirt (either red or any other colour you decide) and shorts (lower part of the body is preferable to exist too, if possible).
The background might be whatever is more suitable for you. But of course, some beach would be great (since he's in a Hawaiian shirt).
As for the art style - you decide. Something extremely close to the original Hazbin Hotel art style would be perfect, but understanding the small reward and the difficulty of such recreation, any style is... probably fine, just make sure it's accurate Alastor and he's nice and happy there, hahah. So yeah! ANY MODEL, ANY LORAS YOU LIKE!
In short, the most important parts are:
Good quality Alastor
Hawaiian shirt (maybe even with baggy long shorts)
Preferably somewhat Hazbin Hotel -ish art style (the closer - the better)
Preferably beach in the background (or something like that)
Hope that's enough of a description.
Have fun!