If you show me how it's currently written I may be able to help, I've played around with getting images to display properly a lot, hehe.
As for the tables...if you give the tables a specific ID then you can style each individual one in the CSS...now I'm not very good with PHP tables but I *think* that the ID for, say, the myadopts table (and the way I've set it up the table that displays user pets on profiles as well), is "adopttable", so in CSS you could edit it with;
Edit:
I tested this and it works :D
#adopttable: myadopts table
#top10: Top 10 adoptables on stats page
#rand5: "5 random adoptables" table on stats page
#shoplist: market
((I have not tested for any others aside from adopttable yet!))
Edit 2:
The .../adopt.php page's table is simply ID'd as "table," so you might want to change that (line 37 in .../view/adoptview.php) to something else so that you can use CSS to customize it :)