Hi! As was said previously, you can only polish a turd so far, but I understand having very small gear budget.. Let me clarify something in your post so I dont go off the wrong direction.. Are you trying to buy gear FROM pictures? Or are you trying to buy FOR pictures? Im guessing from, cuz I think most would want to take pics of their best stuff...
So, Im going to go with some. : )
This is going to be like playing russian roulette. Buying inexpensive gear is walking a thin line anyhow. Now granted, things have come a VERY long way and you can get much nicer gear at a lower cost than in years gone by. BUT, there are also a bunch of turds out there too. And very honestly, there is NO way to tell based on photos. I wish I could say there was if you look at this this and this.. ANY guitar can have raised frets, improper cut nut, bowed neck, etc.. That wont show up in photos.. A cheaper guitar is also more likely to have sharp fret edges, binding the nut slots/improper cut nut, noisy pots, warped neck etc
The best things I can tell you. (again, Im assuming you meant that you are shopping from just photos)
1)TRY to get an "inexpensive guitar from a name brand" vs a "cheap guitar from a no name brand". Even brand names can put out dogs on occasion, but overall they probably will have better quality control and are more likely to stand behind the product .
2) Try to buy from a reputable place. They will be most likely to take care of you if the guitar is a dog. (there is an online place called rondomusic.com. Check them out. They have inexpensive guitars and Ive heard they take care of you if the guitar is flawed.
3)If you are buying from no name place, no name brand. dont spend more than you can afford to lose.
4) find out if there is any kind of return policy..
5) If AT ALL possible, try before you buy. There is ALWAYS a risk buying online or from pics that is could have bad fretwork, warped neck, noisy pots, binding or improper cut nut, etc. EVEN buying a name brand. (tho its less likely)
I hope I was on point with what you were asking and that this helps.. Again some things you simply cant tell from pictures, that can make a huge difference. Good luck