this is probably gonna wind up sideways but whatever, so some of you may "have" to use prosthetics in your cosplay or costume for ren faire or LARPing or whatever you may choose so heres a few tips to get them to look as natural as possible and lasting as long as you need
use a prosthetic with thin edges, latex works best and feels/looks like flesh HOWEVER DO NOT USE LATEX IF YOU'RE IN ANY WAY ALLERGIC even if its just a slight irritation dont do it, go and find silicone prosthetics please dont risk it. after you may ask "what the hell do i attach this prosthetic with?" dont ask that, first you gotta paint it! whether its elf ears like in my photo or a nose or whatever it may be, paint your prosthetic with concealer or flesh tone body paint in your skin tone if you're keeping them flesh colored,if not paint them your desired color then powder with translucent powder or in a powder/eyeshadow the color you painted them, then contour it to look natural, for my ears in my photo to make it look natural i contoured first with a warm red based brown lightly and then again with a cool toned brown and blended

now you can ask "what the hell am i going to attach this prosthetic with" and you can use either liquid latex (not if you're allergic of course) or spirit gum, some people use eyelash glue for a quick job but first, make sure the area you're attaching the prosthetic to is clean and dry and free of skin oils, just wipe the area with a little rubbing alcohol apply your adhesive to the back of your prosthetic on the edges it will be sticking to your skin, if you're using spirit gum tap it to get it tacky and press in place gently then blend in with either liquid latex, or scar wax and cover up the edges with your make up

removal is just as easy, if you used spirit gum use spirit gum remover on a q-tip and rub around the edges where you applied, if you used liquid latex just gently pry it off and clean up with a little oil based make up remover, if you used scar wax use some bond off or gently scrape off what you can and rub with a little baby oil and wash your face