hey, so i wanna play stretched res but i have a 1440p monitor and idk what res is good so could anyone tell me what a good res would be thanks :)

I was commissioned to draw Jett and Killjoy for the small twitch streamer 4Mality. It took a while but I am proud of it so I hope some of y'all would appreciate it too. I've been trying to post this as a linked image but it would not work f...