Nice Comment, I totaly agree with you ,In the next work I will considerThe outer circle of the portal looked good, and the colour didn't seem "off" to me at all, but the centre was less convincing - mainly because it's a portal, so I would be expecting to see something, anything, other than a fuzzy version of the landscape behind. Either a bright light as @indietalk suggests, or an abstract alternative world (maybe colour-matched to the landscape so that it's not immediately obvious.
The interaction between the woman and the portal felt a bit flat - it cast no light on her at all. Even if one could excuse the absence of shadow on the grounds that the source of the light was non-natural, if feels like there should at least be a glow on her skin/clothes as she approaches the portal. As a test clip, maybe that wasn't a priority for you, but if it's intended to be an example of how good your work is, you need to pay attention to every detail - because your customers will!