I also second sage, Lines look good to me. but for coherence if you want it to read clearly do all values or none. You would need a third darker value to make it pop more and read like your ref. If you just have that mid tone alone it could look weak.
idk if it needs the full set of values yet, maybe one darker shape under the head and along the body so it pops like the ref while the mid tone still holds the rest.
maybe keep the mid fur and push one darker shape under the chin and belly so the head pops without flattening the whole cat
