its -> possessive form of "it"
it's -> "it is"
OP seems not to be a native speaker of English but is doing well despite that.
Consider this scenario: You take your car to a mechanic to get fixed. When you get the car back, there are oily finger prints on the hood and fender. The steering wheel is sticky and there is dust on the dashboard. Most people will have concerns about the quality of the work done.
It's the same with all professions. Your potential client probably knows little about the technical aspects of your work, so they will judge you on the basis of things that they can observe and understand.
Just to add to this — most freelance work comes through client recommendations and word-of-mouth referrals. This translates to building a reputation, which in turn requires you take your outlook and presentation very seriously.
I'm not saying you're doing this, but in general — replying "lulz, this projet is dope" to a client will not help a freelancers case.