Hi Marin,
Did you install via the C4P file available on this website? Either way, I want you to try this trick:
Go to the Programs menu of Crossover, and select 'Run Command.' Type regedit in the box, and make sure the "Use Bottle" menu has your Dragon Age bottle selected. Then press run or hit enter. You will get a Registry Editor with a tree of folders on the left side. Navigate to:
HKEY_CURRENT_USER/Software/Wine/AppDefaults/DAOrigins.exe/Direct3D/
With Direct3D selected, there should be keys that read StrictDrawOrdering = enabled and UseGLSL = enabled. If there is no entry for "DAOrigins.exe" under AppDefaults, you will need to create the entry. You can do this by selecting AppDefaults, then going to the Edit menu (in the registry window, not your OSX bar), and clicking "New Key." Name the new key DAOrigins.exe and then create a new key in it called Direct3D.
With Direct3D selected, go to the Edit menu and select New String Value. Name the string UseGLSL. Then right click it, and select Modify. In the box, type enabled and click okay. Repeat this process to make a String Value called StrictDrawOrdering. Then right click it, Modify, and type enabled.
Once you have made these changes, or have seen whether these values already exist, close the registry editor and try the game again. If you still have the same portrait problems, or are confused about how to edit the registry, let me know and I will provide you further assistance.
And don't worry, your English is great!
Best,
Nathan