Nux, don't smear those pencils.
for smearing, try using packaging paper and coal, what can be awesome when practicing enough.
and as you are "mixing" animals to achieve goon heads, try to think about the examples first, like a goon could be a crossing of a turtle with a manta as i imagine, or something like this. check skeletons.
and don'T draw with colors because you can't do as much shades!