I handed in my undergraduate thesis in mathematics and since I had extra time due to COVID-19 lockdown, I had made a cover drawing for it that I included. I've never seen a thesis with a cover in the STEM field before.
Was it a bad decision on my part? Will it look like kowtowing/bootlicking my supervising professor for a better grade? I believe my work was pretty good on its own and I'm afraid I have ruined it with what was intended as a personal touch that I really wanted to add.