>>264605703
>>264605814
I think you already have enough to go off of. Just cut these up and stick these profile views into blender for the front/side planes. Not sure how to do it in 2.8 but you can google.
Honestly since you're going for the anime aesthetic you really don't need to do much modelling what you can do is take a "base mesh" from another avatar that looks similar to yours and push/pull the verts until they start to line up to your sketch. Most 3d artists reuse a good base mesh so they aren't constantly reinventing the wheel so to speak.
However, if you are wanting to go from scratch completely look up some character modelling tutorials to get the basics. The most important thing is understanding what your mesh topology should look like, where quads follow the musculature and such.
Otherwise the most important thing is just to start doing something I made my own from scratch and you learn the most from the process itself. You'll figure out what needs to be improved as you go. You can post progress here and I'm sure people would give you pointers.