OK, indeed, it's simple, I'll give you that, but, in my opinion,
too simple. I can see your point about simple being professional, and it's true! However, professional does not have to mean a box with some lines in
Remember, as a design company, you are trying to sell yourself to your prospective clients, trying to show them that you can give them a design they'd
really want and, I'm sorry to say, but, right now, you're not doing that.
I'm not saying you need to go for the big flashy design, just elaborate it a little bit more, make a bit more eyecandy. Yes, clients want professionalism (simple), but, they do want a bit of eyecandy to grab the attention too

It's a fine blend, getting that balance of professionalism, but without going over the top.
I love the navigation, it just - works! But, get some graphics in there! It's just white space with text at the minute, get some nice stock photos of cool desks and technological watch-a-majiggys - it looks good on a design site to have some technological stuff - shows you are advanced and up to date.
Elaborate on your services a bit - "We offer Photoshop graphics / logo design" Oh do you? Cool, but, um, what type of design? Any special process? Any idea of prices? How do I order? Think of your clients as stupid - just hear me out

- they want to know what they can get, when they can get it and where they can get it - and they want to know it straight away!
Finally, having "blah. more stuff" and "whee! stuff" on your business website is not really a good idea! I don't know if you have started to advertise yet, but I would advise you to make sure your site is fully completed and ready before you do!
Quite a long critique, but, I feel, a worthy one. :imho: you have a good start , it just needs building upon and extending a bit and it could be great!