There are tons of ways to do this in Blender. Some people make a place and then place it on the model and then use the shrinkwrap modifier and start extruding faces. Personally I collapse a plane into a single vertex and just use the snap to face object and then extrude verts to draw edgeflow and then I fill them in by…
I think you could use sth from this tutorial by Lennyagony, look for the low poly part and the parts below that. http://steamcommunity.com/sharedfiles/filedetails/?id=123397498
don't know about blender but you can retopo in zbrush, although i didn't use it look for a tutorial on youtube to understand the basic and then u can start retopo right-away
I saw motenai's tutorials and i gave it a go,so here is my low model i created next to my high model! Is this the way its done? Ps i forgot to create the opening in the blade,i fixed it now!
If you just do it for practicing you can invest more time in each process. You'll find out that is much satisfying if you just put more effort into it. and in time you'll see progress. Also i sugest you to get some tutorial to have an ideea what each process mean. You can watch motenai videos on youtube those are very…