Many possible variants: "pretty" or "looks good" or even "beautiful" for "guapa"; "Pe's appeal or gutsiness", "the appeal or the gutsiness Pe has", "isn't yet as appealing or as gutsy as Pe" for the rest.

A different interpretation. This arises from consulting my Spanish wife. I first asked her what physical attribute "agarraderas" implies in Spain. She said it can imply the hips, the bottom or the breasts: it basically means flesh you can get hold of. However, when I asked her about the whole phrase and explained the context, she said without hesitation that it wasn't talking about physique at all. It was referring to the qualities mentioned above.

In any case, though it's quite true that Penélope Cruz, who used to be rather waif-like, has filled out with the passing years (especially since she had her baby) and is now more voluptuous, she's not that much fleshier than Blanca Suárez. I've been looking at pictures of the two (purely for research purposes, of course) and I wouldn't say that Blanca is much thinner or less curvy than Pe. At any rate, I don't think that's what you would pick out when comparing them in this context.

What I think it's saying is that physically Blanca has what it takes, but she currently lacks other qualities that make Pe special. Penélope Cruz is beautiful, but she's much more than a pretty face and body: she has a powerful screen presence and conveys great force of character. That's what marks her out and makes her so watchable.

I wondered about "agarraderas" anyway, but couldn't see what "estómago" might mean. My wife is quite clear that "agarraderas" means "gancho" and "estómago" means "fuerza, resistencia, un todoterreno". According to the RAE, "agarraderas" can figuratively mean:

"pl. coloq. Favor o influencia con que alguien cuenta para conseguir sus fines."

It's not influence here but appeal, including but not limited to sex appeal. It's a matter of screen presence, of pulling power, watchability.

"Tener estómago" can mean having a strong stomach, and by extension it means you can cope with whatever comes up. It's got an element of versatility and of staying power. But I think the best word is actually quite close to "estómago": gutsy, gutsiness. Almodóvar reportedly summed up Penélope's qualities as follows:

"Pedro Almodóvar once said, that his Spanish muse, Penélope Cruz, belongs to the "carnal, gutsy, cleavage-heaving, loud" Mediterranean school of acting, a style, also shared by Italian actor and yesteryear screen-scorcher Sophia Loren."
http://articles.timesofindia.indiatimes.com/2011-05-04/news-...

This actually points back to voluptuousness, but I'm sure that's not what "agarraderas" means in this particular case. This comment means that Blanca looks the part but doesn't yet have Penélope's power and screen presence.


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Note added at 2 days19 hrs (2012-07-23 11:35:06 GMT)
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For "de momento", you could say "as yet".

I think you're absolutely right to emphasise that slang is country-specific. This comment is made by a Spaniard for Spanish readers; it wouldn't necessarily have been said the same way in a Latin American country.