I feel like different versions of this question has been coming up quite a bit lately. and it always goes like this: "Hi, I'm a beginner to intermediate and I know know not much to some things. I have this gig coming up for this client who wants me to do this thing, and I'm not sure if I have enough equipment to do what they want. This is what I have." it seems like this comes up at least once a week around here these days. I'm not saying that it's not a semi-valid question, or that the aren't times when it's appropriate, but it's getting a bit out of control.
There are numerous things that are very wrong with this line of questioning. First, skill levels are far more important than gear, so the questions of gear is moot, if you don't have the skills to pull off the job. Second, what does the client want? What gear you have and what gear you need is entirely determined by what the client is hoping to accomplish. It's true, very skilled people can do a lot with very little gear, but there are still many Lois that are entirely gear dependent. In your situation, what does the client want?
These questions always represent two missing pi exes of very crucial knowledge: what the client wants and what can be accomplished with what gear. This process should always be nothing more than a knowledge of what the client wants, and a knowledge of what you are capable of doing with your gear. And in my opinion, before you start charging for gigs, you should really be pretty good at discerning those tow things.
This isn't really about professional or not professional looking images. It's about what looks you are capable of achieving. Do they want an environmental portrait using natural light? You can do that. Do they want a one light portrait against fading twilight? You can do that. Do they want a midday group shot with beautiful soft light that over powers the sun? You can't do that. Any of those options could be top notch, professional looking, or look like crap. This isn't about that. It's about capabilities. You should know what a client wants and if you have the capabilities to pull it off before you sign on to a job.