improving nicely
i like that youre experimenting with hand designs
simple lines and getting the layering look nicely
suggestion for this set: not sure if those purple lines near the top are supposed to be eyes, if so, theyr not doing the job well enough.
id suggest leaving them there and use them as like... helmet edges and adding some sort of eye shapes directly underneath. will complete the set quite nicely
over all suggestion: try doing something with a background colour other than white, but unlike what riverchen said, id make the background a less prominent colour or a darker one, and keeping the bright ones on top.