Gallery Screenshots / Lighting HELP

I'm hoping somebody can help me with an issue I've been having regarding gallery screenshots. A lot of times, when I'm uploading a house, the lighting in my screenshot is absolutely horrible. I have my graphics set to ultra, and the time of day when I take my screenshot is the afternoon , which is the brightest time of day. The poor lighting makes my screenshots look grainy and less detailed, and could steer people away from downloading my creations. I've even tried downloading a house from the gallery which includes photo's with pristine lighting, placing them on the same lot that the gallery screenshots were taken on, and trying to save them to my library to see if the lighting is the same, and it never is.

Is there a specific time of a day where you will get the best lighting for an optimal upload screenshot? Is there a way to fix your lighting/make it brighter? Thanks.