If they are to show a general overview of your work then, without wishing to be negative, I think you need to work on the pics.
Your camera, with 18MP, is certainly capable of producing much better pics.
I have used, and in fact still have, the 75-300mm lens you have and, although most people seem to decry it, up to 200mm it is a quite capable lens, but from 200-300mm it is quite soft so I would only use it up to 200mm and, since it doesn't have Image Stabilisation, at fairly high shutter speed.
The spider one is reasonable taking into account the equipment you have, but you might think about getting a cheap set of close up filters off ebay for your kit lens.
Although again others will decry this particular suggestion for about £10.00 they are the cheapest option for macro, if you want to add to your portfolio.
The third shot in your portfolio, "The Smiler" has been exposed for the sky with the result that the faces of the people are too dark really.
But the main problem with them is that, overall, they are not particularly interesting.
I do hope though that you do understand that I am not trying to be negative, but trying to point out shortcomings in your photos and how they might be improved.
You have a good camera and fairly good lenses so basically all you need to do is practice, practice, and then practice some more.
And take a LOT of pictures so you can choose the best for your portfolio.
And the best of luck.