Hey don't let it discourage you, peps can be difficult to get right sometimes. I don't even like to look at pics from my first ever space marine pep I did years ago, was all sorts of messed up.
As a whole it looks a little too stretched height wise, and yeah the side warps will make getting it to an accurate boba difficult (also some minor issues like the forehead triangles being too big, etc), but you should be able to pretty easily salvage this into a mando build if you want. Besides those issues it looks like a pretty solid helmet otherwise. The cheeks and dome curvatures in particular, getting those right are always a big problem area in peps.