Point 1:

the apperance.

The businessangel must belive that he has it to do with motivated and also experienced people, this generates
"trust" in your abilities, and that you pursue the tasks.

In the end you using other peoples equity. And since they
have limited knowledge about you and you collegues (principle -- agent problem), they must trust in your marketing proposes and your
personal apperance.

-> A good advice: go over your web-apperence. You website
looks not very appeling from it looks. Its not very nicely
structure, returns server errors (you are an "online" company!),
and soed not have a nice style.
Maybe you try to put some effort, a day or two to at least
structure and style yout webpage.
As a 1-mill dollar investor I would at least have a peak at the site.

Point 2:

Make the investor have enoug information to asses if this
investment is yielding a profit for him over a reasonable time.

-what are the key selling points of your product
-what is different to compeating products
(even if it is just to be less costly and more flexible
than a large company)
-how well runs your architecture
-how can you re-use your architecture in future products, or different uses (like a marketing portal for example),
or as use in university research projects
-what do your expect to learn by the pertnership (if you where
perfect, you would not have to ask for help)
-make a discounted cashflow analysis (or at least propose
cashflow expectations), a business angel or any investor will do that
to assess an investment (profit/risk ratio)
-set reasonable deadlines (concept approval,alpha, beta, testingphase)

...

hm, and stuff like that