hey whats up man, welcome to the site! i recognize your youtube from a comment u left on one of my vids, glad to see you working on your dance and coming here for critique(one of the best things you can do to progress)
how long have you been learning/practicing liquid?
first off some good things i noticed about the clip:
-decent variation, not much repetitiveness
-good hand articulation
-decent understanding of space for your level
and heres some stuff i think you need to work on:
-more continuous paths, learn howto change direction without suddenly going reverse direction
-vertical levels, bend more at the knees and waist to lower and raise your flow
-use more of the space around you, play around with flowing above your head, further to your sides, and behind your back
-posture and framing(read below)
ok so for this i'm going to give you the posture framework that i am using, if its a bit hard to understand sorry, i'm still working to understand it better so i can teach it in a more concise and simple manner. i havent had to explain it much. kai is also working on some new tutorials and things will be much easier to explain once that gets put out.
first off some simple things, pick your head up and dont look at your flow, look at anything else. secondly, realize that every line your body is making well either accentuate or distract(and weaken) from what your doing with your wrist and hands. a good rule of thumb to is to make the simplest lines and angles with your body, like these 45degree ones:

you dont HAVE to be strict to these lines but for building foundation and a good framework i think you should.
go back to the quick practice clip u commented on and pay close attention to my forearms and shoulders and u'll see that for the most part they are always aligned to that grid, this accentuates even the most basic movements. this also applies to the 3rd dimension.
learning howto lock your shoulders into making good lines while having a full range of motion with your arms can be a daunting and time consuming task but trust me its better you start on it now than have togo back and learn it later. if your doing it correctly you should be feeling alot of your movement come from your core and the muscles that are adjacent to your shoulder(tricep, bicep, outer pectoral, etc). eventually you want to make it so every possible line that your body mades adheres to the grid as much as possible but for now i feel that the shoulder-to-shoulder line and your forearms are the most important to start with.
for more on the grids and other tutorials check out
http://www.reddit.com/r/liquiddance/hope to see more clips from you!