It's quite alright! You've used the layers correctly and I can't spot any obvious errors. My only complaint would be that the outline thickness varies a bit -- it's almost invisible near the forehead, but it becomes quite thick behind the shoulder.
Welcome to the forum, by the way.
If you'd like to post your work on the
Downloads section then please feel free to do so. It probably isn't
necessary for a "niche" game like Yandere Simulator, because people interested in the game can simply watch this thread. However, it would allow people to discover your work while searching for related
tags (such as
"green hair" or
"high school" or
"ponytail").
P.S. Your image filename suggests that you're playing SDT via the copy hosted on the lolhentai website. If you need help setting up a local copy then there are a few guides available to help out. Running a local copy would give you the ability to customize your gameplay experience with various Loader mods. For example, I use @sby's animtools mod to adjust the girl's posture and hide the male character - allowing me to generate preview images with a "minimalist" style and few distractions.
If you already have a local folder set up, and you merely used the lolhentai site as a "clean" environment to quickly test your hairstyle and grab a few in-game screenshots, then please ignore the preceding paragraph.