This is an OK triphone sample. Try to keep the spacing between the syllables even. Don't make the consonants too long. Vowel length doesn't matter much as long as you don't run out of breath.
Preferably, you should keep a perfectly straight pitch, that way you'll avoid artefacts (this is more noticeable when using resamplers that loop rather than stretch).
You can always modify and flatten the pitch after you're done recording in Melodyne or something similar.
The red line represents pitch. If you record using Oremo there's also a pitch and key guide available there. Try to stay on roughly the same key throughout the recording, otherwise the samples will sound a bit inconsistent.
Also, be sure to practise your vowel pronounciations, you don't want two different sounding (for instance the A in cake and the A in man sound very different, be sure to stick with one sound for each vowel) vowels of the same sort since in triphones this will be very noticeable.